ACT Math · Circles, arcs, and sectors

A central angle measures 88°. What is the measure of an inscribed angle that intercepts the same arc?

A central angle measures 88°. What is the measure of an inscribed angle that intercepts the same arc?

Answer and explanation

Answer: G: 44°

An inscribed angle is half of the central angle that intercepts the same arc. The central angle is 88∘88^\circ, so the inscribed angle is 88∘2=44∘\frac{88^\circ}{2}=44^\circ, choice G. Choice H (88∘88^\circ) is the central angle itself. Choice J (176∘176^\circ) doubles the angle instead of halving it, which would apply if you were going from an inscribed angle to its central angle. Choice F (22∘22^\circ) halves twice. A useful check is that the inscribed angle's vertex lies on the circle, so it sees the same arc from farther away and appears smaller than the central angle.

More Circles, arcs, and sectors questions

All Circles, arcs, and sectors questions

Learn the method behind questions like this one

The ACT Math course teaches each tested skill through lessons, step-by-step solutions to sample problems, the complete study guide and full-length practice tests.