Angles in circles

Inscribed angleCenter angle given

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The angle at the center is given. Find the angle on the circle.

Inscribed angleCircle angle given

Name: Date:

The angle on the circle is given. Find the angle at the center.

Triangle circlesThe circle through the corners

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Each circle passes through all three corners. Find its radius.

Triangle circlesThe circle inside

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Each circle just touches all three sides. Find its radius.