Question

In this fig angleBCD is an exterior angle of triangleABC. If angleBCD = 3x, angleA=x and AngleB = 80°, find the value of x​

Answer 1

Answer:

x=40°.

Step-by-step explanation:

By exterior angle property, the exterior angle is equal to the sum of the two opposite interior angles.

80+x=3x

80=3x-x

80=2x

80/2=x

x=40°.

Hope this helps.