What is the least angle measure by which this figure can be rotated so that it maps onto itself?

a. 45°

b. 90°

c. 180°

d. 360°.

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# What is the least angle measure by which this figure can be rotated so that it maps onto itself?
a. 45°

a. 45°

b. 90°

c. 180°

d. 360°.