The figure shows a cyclic quadrilateral ABCD with the incircles O_{1} and O_{2} of the triangles ABC and ACD. If the measure of angle BAD is 80 degrees find the measure of angle O_{1}, O_{2}D.

Incircle is a circle within a triangle, that is tangent to each side.

A cyclic quadrilateral is a quadrilateral whose vertices all lie on a single circle.

Geometry Problems

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Ten problems: 1411-1420

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Cyclic Quadrilateral

Circle

Triangle

Angle

Angle Bisector

Incircle

Triangle Centers

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