AMC / AIME · Circle Geometry · Easy

Circle Geometry: A central angle measures math. What fraction of the circle is its sector?

Chords, arcs, angles.

Try the problem

A central angle measures 90∘90^\circ. What fraction of the circle is its sector?

Hint and answer

Concept to use

Central angles.

Hint

Use radius, diameter, arc, and angle relationships.

Answer

1/4

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