Question

Following diagram find the missing measure.

m 21 =3x, m
2 = 4x, m
3 = 2x, find x.

A.10
B.20
C.30
D.40

Answer 1

B

Explanation:

The diagram basically shows three angles that make up a straight line.

We know the angle of a straight line is 180°.

Since there are three angles, Angle 1, Angle 2, and Angle 3 that make up a straight line, we can write:

Angle 1 + Angle 2 + Angle 3 = 180

3x + 4x + 2x = 180

9x = 180

x = 180/9

x = 20

The correct answer is B