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Circles

Circles

Example 1

Any diameter is also a chord. True or false?

Example 2

Any radius is also a chord. True or false?

Example 3

In the figure below, points A, B, C, and D are on ⊙O and ABCD. Do we know for sure whether arc AB is congruent to arc CD?

Example 4

In the figure below, points A, B, C, and D are on ⊙O and m∠AOB = 37° and m∠AOB = 40°. Do we know for sure whether ABCD?

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