If the measures of two of the interior angles of a triangle are 40 and 20, what is the measure of the
last angle?
a. 30
b. 60
c. 90
d. 120


Sagot :

Answer: D. 120

Why?

Triangle has 180 degrees measurement, so 40 + 20 = 60 + 120 = 180, that is why the answer is letter D.

Hope it helps