Question

What’s the missing angle
?

Answer 1

x=20

3x= 3(20)=60

4x= 4(20)=80

Explanation:

The angles CD is 90 degrees because the small square indicates

it. Angles AD are a straight angle, therefore all the other angles within A to D, must equal 180 degree. (straight line/angle=180 degrees).

so AB + 70+ 90= 180 degrees

AB= 180 -70-90

AB=20

x=20

3x= 3(20)=60

4x= 4(20)=80

Answer 2

Explanation:

x + 3x + 4x + 70° + 90° = 360° ( being complete turn )

8x + 160° = 360°

8x = 360° - 160°

8x = 200°

x = 25°

3x = 3 * 25°= 75°

4x = 4 * 25° = 100°