How to find a missing measure of a triangle

To determine to measure of the unknown angle, be sure to use the total sum of 180 degrees.

Step-by-step explanation:

if two angles are given , then add them together and the subtract from 180 degrees. if two angles are the same and unknow, subtract the know angle from 180 degrees and then divide by two hope this helps

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.