# Lesson 11 Circle Challenges Practice Understanding

Find the perimeter of each polygon.

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Write the equation of circle

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The point

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The diameter of a circle measures

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Triangle

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A circle lies in Quadrant II, tangent to

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Three points on a circle are

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Complete the square to find the center and radius of a circle defined by the equation

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Complete the square to find the center and radius of a circle defined by the equation

Fill in the number that completes the square. Then write the trinomial as the square of a binomial.

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Factored form:

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Factored form:

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Factored form:

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Factored form:

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Factored form:

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Factored form:

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Factored form:

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Factored form: