MathSux^2

Geometry: Median of a Trapezoid Theorem

*If you haven’t done so, check out the video that goes over this exact problem, also please don’t forget to subscribe!

Screen Shot 2020-06-02 at 7.31.07 AM Step 1: Let’s apply the Median of a Trapezoid Theorem to this question! A little rusty? No problem, check out the Theorem below.

Median of a Trapezoid Theorem: The median of a trapezoid is equal to the sum of both bases. Screen Shot 2020-06-02 at 7.32.31 AM Step 2: Now that we found the value of x , we can plug it back into the equation for median, to find the value of median

Screen Shot 2020-06-02 at 7.34.48 AM

Want more practice? Your wish is my command! Check out the practice problems below:

Practice Questions:

1.is the median of trapezoid ABCDEF, find the value of the median, given the following: Screen Shot 2020-06-02 at 7.35.47 AM 2. is the median of trapezoid ACTIVE, find the value of the median, given the following: Screen Shot 2020-06-02 at 9.16.22 AM 3.is the median of trapezoid DRAGON, find the value of the median, given the following: Screen Shot 2020-06-02 at 9.22.13 AM

4. is the median of trapezoid MATRIX, find the value of the median, given the following: Screen Shot 2020-06-02 at 9.23.43 AM

Solutions:

Screen Shot 2020-06-02 at 9.25.05 AM

Need more of an explanation? Check out the detailed video and practice problems. Happy calculating! 🙂

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Algebra: Completing the Square

Learn how to Complete the Square by clicking on the Youtube video and trying the practice problems below. Happy Calculating! 🙂

Click the picture below to view the Youtube video.

Complete the Square copy

Practice Questions:

Screen Shot 2020-05-23 at 5.28.54 PM

Solutions:

Screen Shot 2020-05-23 at 5.29.19 PM

Need more of an explanation? Check out why we complete the square in the first place here and please don’t forget to subscribe! 🙂

Geometry: Area of a Sector

Hi math friends, has anyone been cooking more during quarantine? We all know there is more time for cookin’ and eatin’ cakes but have you ever been curious about the exact amount of cake you are actually eating?! Well, you’re in luck because today we are going to go over how to find the area of a piece of cake, otherwise known as the Area of a Sector!

Now, we’ll all be able to calculate just how much we are overdoing it on that pie! Hopefully, everyone is eating better than I am (I should really calm down on the cupcakes). Ok, now to our question:

*Also, If you haven’t done so, check out the video that goes over this exact problem, and don’t forget to subscribe!

Screen Shot 2020-05-19 at 4.18.42 PM Explanation:

How do I answer this question?

We must apply/adjust the formula for the area of a circle to find the area of the blue shaded region otherwise known as the sector of this circle.

How do we do this?

Before we begin let’s review the formula for the area of a circle. Just a quick reminder of what each piece of the formula represents:

Screen Shot 2020-05-19 at 4.24.28 PM Step 1: Now let’s fill in our formula, we know the radius is 5, so let’s fill that in below:

Step 2: Ok, great! But wait, this is for a sector; We need only a piece of the circle, not the whole thing. In other words, we need a fraction of the circle. How can we represent the area of the shaded region as a fraction?

Well, we can use the given central angle value, , and place it over the whole value of the circle, . Then multiply that by the area of the entire circle. This will give us the value we are looking for!

Screen Shot 2020-05-19 at 4.27.45 PM Step 3: Multiply and solve! Screen Shot 2020-05-19 at 4.28.38 PM

Ready for more? Try solving these next few examples on your own to truly master area of a sector!

Find the area of each shaded region given the central angle and radius for each circle: Screen Shot 2020-05-19 at 4.29.40 PM

Check the solutions below, when you’re ready: Screen Shot 2020-05-19 at 4.30.36 PM What do you think of finding the area of sector? Are you going to measure the area of your next slice of pizza? Do you have any recipes to recommend? Let me know in the comments and happy calculating! 🙂

Algebra 2: Solving Radical Equations

Today we’re back with Algebra 2, this time solving for radical equations! Did you say “Radical Equations?” As in wild and crazy equations? No, not exactly, radicals in math are used to take the square root, cubed root, or whatever root of a number.

Radicals are actually pretty cool because we can write them a couple of different ways and they all mean the same thing! Check it out below: Screen Shot 2020-05-12 at 11.23.20 AM.png Still not sure of their coolness? Let’s see what they look like with actual numbers:
Example: Solve the following algebraic equation below for the missing variable (aka, solve for x).Explanation:

How do I answer this question?

The question wants us to solve for x using our knowledge of radicals and algebra. You can also check out how to solve this question on Youtube here!

How do we do this?

Step 1: We start solving this radical equation like any other algebraic problem: by getting x alone. We can do this easily by subtracting 7 and then dividing out 5. Screen Shot 2020-05-12 at 11.26.21 AM.png Step 2: Now, to get rid of that pesky radical, we need to square the entire radical. Remember, whatever we do to one side of the equation, we must also do to the other side of the equation, therefore, we also square 14 on the other side of the equal sign.

*This gets rid of our radical and allows us to solve for x algebraically as normal! Screen Shot 2020-05-12 at 11.29.11 AM.png What happens when there is a cubed root though!?!? When dividing polynomials with different value roots, raise the entire radical to that same power of root to cancel it out: Screen Shot 2020-05-12 at 11.30.21 AM.png Remember, we know radicals can also be written as fractions: Therefore we also know that if we raise the entire radical expression to the same power of the root, the two exponents will cancel each other out:Want more practice? Try solving these next few examples on your own. Screen Shot 2020-05-12 at 11.32.39 AM.png When you’re ready, check out the below:

Did I miss anything? Don’t let any questions go unchecked and let me know in the comments! Happy calculating! 🙂

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Algebra 2: Dividing Polynomials

Now that everyone is home, there is no better time to go over dividing polynomials! Whether school is out or not, dividing polynomials will always come in handy… I think.

Either way at some point, you may need to know how to answer these types of questions. The cool thing about dividing polynomials is that it’s the same long division you did way back in grade school (except now with a lot of x). Ok, let’s get to it and check out the question below:

Also, if you haven’t done so, check out the video related that corresponds to this problem on Youtube! 🙂

Screen Shot 2020-05-04 at 10.21.17 PM Explanation:

How do I answer this question?

The question wants us to divide polynomials by using long division.

How do we do this?

Step 1: First we set up a good ole’ division problem with the divisor, dividend, and quotient to solve. Screen Shot 2020-05-04 at 10.43.48 PM.png Step 2: Now we use long division like we used to back in the day! If you have any confusion about this please check out the video in this post. Screen Shot 2020-05-04 at 10.22.52 PM What happens when there is a remainder though!?!? When dividing polynomials with a remainder in the quotient, the answer is found and checked in a very similar way! Check it out below:

Screen Shot 2020-05-04 at 10.24.06 PM

Notice we represented the remainder by adding to our quotient! We just put the remainder over the divisor to represent this extra bit of solution.

Want more practice? Try solving these next few examples on your own. Screen Shot 2020-05-04 at 10.45.10 PM.png When you’re ready, check out the solutions below:I hope everyone is finding something fun to do with all this extra time home! That can include everything from baking a cake to studying more math of course, happy calculating! 🙂

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Earth Day Fractals!

In honor of Earth Day last week, I thought we’d take a look at some math that appears magically in nature. Math? In nature? For those of you who think math is unnatural or just terrible in general, this is a great time to be proven otherwise!

The key that links math to nature is all about PATTERNS. All math is based on is patterns. This includes all types of math, from sequences to finding x, each mathematical procedure follows some type of pattern. Meanwhile back in the nearest forest, patterns are occurring everywhere in nature.

The rock star of all patterns would have to be FRACTALS. A Fractal is a repeating pattern that is ongoing and has different sizes of the exact same thing! And the amazing thing is that we can actually find fractals in our ~~neighbor’s~~ local garden.

Let’s look at some Fractal Examples:

(1) Romanesco Broccoli: Check out those repeating shapes, that have the same repeating shapes on those shapes and the same repeating shapes on even smaller shapes and…. my brain hurts!

(2) Fern Leaves: The largest part of this fractal is the entire fern leaf itself. The next smaller and identical part is each individual “leaf” along the stem. If you look closely, the pattern continues!

(3) Leaves: If you’ve ever gotten up real close to any type of leaf, you may have noticed the forever repeating pattern that gets smaller and smaller. Behold the power and fractal pattern of this mighty leaf below!

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Just in case fractals are still a bit hard to grasp, check out the most famous Fractal below, otherwise known as Sierpinski’s Triangle. This example might not be found in your local back yard, but it’s the best way to see what a fractal truly is up close and infinite and stuff.

Looking for more math in nature? Check out this post on the Golden Ratio and happy calculating! 🙂

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Geometry: Perpendicular Lines

Screen Shot 2020-04-22 at 4.44.43 PM Screen Shot 2020-04-22 at 4.45.00 PM Screen Shot 2020-04-22 at 4.46.02 PM Screen Shot 2020-04-22 at 4.47.52 PM Screen Shot 2020-04-22 at 4.48.15 PM