Question

In ∆PQR, if ∠P = 60°, and ∠Q = 40°, then the exterior angle formed by producing QR is equal to ______.

Options

• 60°

• 120°

• 100°

• 80°

Answer 1

In ∆PQR, if ∠P = 60°, and ∠Q = 40°, then the exterior angle formed by producing QR is equal to 100°.

Explanation:

Let QR is produced to a point S.

In ∆POR, ∠PRS = ∠P + ∠Q  ......[Exterior angle property]

∠PRS = 60° + 40 = 100°