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Math

Math Snap

PROBLEM

11. Using the triangle below, set up and solve an equation in order to find the value of xx.
12. Find the measure of the largest angle in the triangle shown.

STEP 1

What is this asking?
We need to find the value of xx using the right triangle, and then use that value to find the biggest angle in the other triangle.
Watch out!
Don't forget that angles in a right triangle add up to 9090^\circ and angles in any triangle add up to 180180^\circ!

STEP 2

1. Solve for x
2. Find the largest angle

STEP 3

Alright, so we've got this right triangle, and we know two of its angles: (15x)(15x)^\circ and (8x2)(8x - 2)^\circ.
Since it's a right triangle, the third angle is 9090^\circ!

STEP 4

Now, here's the magic: all the angles in a triangle always add up to 180180^\circ.
So, let's write that down as an equation:
(15x)+(8x2)+90=180 (15x) + (8x - 2) + 90 = 180

STEP 5

Time to combine like terms!
We've got 15x15x and 8x8x, which add up to 23x23x.
And we've got 2-2 and 9090, which make 8888.
So, our equation becomes:
23x+88=180 23x + 88 = 180

STEP 6

To isolate our xx term, let's subtract 8888 from both sides of the equation:
23x+8888=18088 23x + 88 - 88 = 180 - 88 23x=92 23x = 92

STEP 7

Almost there!
Now, we divide both sides by 2323 to find the value of xx:
23x23=9223 \frac{23x}{23} = \frac{92}{23} x=4 x = 4 Woohoo! We found that x=4x = 4!

STEP 8

Okay, so we know x=4x = 4, and we need to find the largest angle in the other triangle.
Its angles are (24x)(24x)^\circ, (21x)(21x)^\circ, and (15x)(15x)^\circ.

STEP 9

Let's substitute x=4x = 4 into each angle:
244=96 24 \cdot 4 = 96 214=84 21 \cdot 4 = 84 154=60 15 \cdot 4 = 60 So, the angles are 9696^\circ, 8484^\circ, and 6060^\circ.

STEP 10

The largest angle is clearly 9696^\circ!

SOLUTION

The value of xx is 44, and the largest angle in the second triangle is 9696^\circ.

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