In triangle PQR, the measure of angle P is 36 degrees. The measure of angle Q is five times the measure of angle R. How do you find the measurement of angle Q and the measurement of angle R?
"the sum of measures of these three angles of any triangle is invariably equal to the straight angle, also expressed as 180°"
From the problem we can write:
We can also write from Geometry, the sum of the three angles is 180 degrees, or:
We can substitute