Question

Find the measure of the exterior ∠1.
A. 60°
B. 80°
C. 150°
D. 90°

Answer 1

Explanation:

As the sum of all angles of triangle is 180°

and we have been given 2 angles i.e 30° and 60°

So, Third angle will be 90°

Angle 1 = 180°-90° (as the value of angle made by a straight line is 180°)

Angle 1 = 90°

Answer 2

`\qquad\qquad\huge\underline{{\sf Answer}}`

Measure of an exterior Angle of a triangle is sum of two opposite interior angles of the same triangle ~

that is :

`\qquad \tt \dashrightarrow \: \angle1 = 60 + 30`

`\qquad \tt \dashrightarrow \: \angle1 = 90 \degree`

So, D is the correct choice ~