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quadrilateral abcd is inscribed in this circle.

what is the measure of angle b?

enter your answer in the box.

m∠b=

General Idea:

A cyclic quadrilateral has all its vertices on the circumference of the circle. The opposite angles of a cyclic quadrilateral are supplementary, that is it add up to get 180 degrees.

Applying the Concept:

Opposite angles B and D add up to give 180 degrees.

Conclusion:

When Quadrilateral ABCD is inscribed in this circle, the measure of angle B for the given diagram is