Answer:

Step-by-step explanation:
Given

Required
Determine 
To do this, we make use of the following identity

Substitute: 

Solve the numerator


Rewrite as:


Take square roots

10x + 12 = 52
10x = 52 - 12
10x = 40
10x / 10 = 40 / 10
x = 4
Since we know that a triangle equals to 180 degrees, we should start by adding together the two known angles inside the triangle. To determine to measure of the unknown angle, be sure to use the total sum of 180 degrees. If two angles are given, add them together and then subtract from 180 degrees. If two angles are the same and unknown, subtract the known angle from 180 degrees and then divide by 2.
Answer:
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