A circle has points P, Q, R on a circle in such a way that angle PQR is 60° and angle QRP is 80°. Calculate the angle subtended by an arc QR at the centre.

A circle has points P, Q, R on a circle in such a way that angle PQR i

1.	A circle has points P, Q, R on a circle in such a way that angle PQR is 60° and angle QRP is 80°. Calculate the angle subtended by an arc QR at the centre.
A.	40°
B.	80°
C.	100°
D.	120°
Answer» C. 100°

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A circle has points P, Q, R on a circle in such a way that angle PQR is 60° and angle QRP is 80°. Calculate the angle subtended by an arc QR at the centre.

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