Answer:
A
Explanation:
angle 3 and 4 make a 180° angle
so angle 3 = 180 - 81 = 99°
because sum of 3 angle in 1 triangle equal 180°
angle 2 = 180 - angle 3 - angle 1
angle 2 = 180 - 99° -42° = 39°
DONE :))
a. 39°
The sun of two interior angles' measure in a triangle is equal to an exterior angle that is not neighbouring them.
Therefore m<1 + m<2 = m<4
if 42° + m<2 = 81° then m<2 = 81° - 42° ➡ m<2= 39°
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