In a circle, angle subtended by chord AB at the center is 80°. What is the measure of angle ACB$, where C lies on the circle?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 40°
Angle at center = 2 × angle at circumference (same chord)
Angle at circumference = Angle at center / 2
Angle at circumference = 80 / 2
Angle at circumference = 40°