Question

The sum of the angles of a triangle is 180 degrees. if one angle of a triangle measures x and the second angle measures (3x +12) degreas, express the measure of the third angle in terms of x. simplify the expression.

Answer 1

180°-x°-(3x°+12°) = the 3rd angle

180°-x°-3x°-12°=

168-4x

168-4x=0

-4x=-168

x= 42°

1st angle =42°

2nd angle = 138°

3rd angle = 10°

Explanation: