Hello Casrdunn6976, to find the angle measure of a triangle with x and x+4 and 9x you have to, Just like regular numbers, angles can be added to obtain a sum, perhaps
for the purpose of determining the measure of an unknown angle.
Sometimes we can determine a missing angle because we know that the sum
must be a certain value. Remember -- the sum of the degree measures of
angles in any triangle equals 180 degrees. Below is a picture of
triangle ABC, where angle A = 60 degrees, angle B = 50 degrees and
angle C = 70 degrees,If we add all three angles in any triangle we get 180 degrees. So, the
measure of angle A + angle B + angle C = 180 degrees. This is true for
any triangle in the world of geometry. We can use this idea to find the
measure of angle(s) where the degree measure is missing or not given.
