Geometry – circles

Q: The area of a 45 degree sector of circle M is 100 square units. What is the area of circle M?

Answer: 800 square units

Explanation:  The 45° sector is exactly 1/8 of the circle. (45/360 = 1/8)

100 = 1/8 of the area of the whole circle.

The area of the whole circle is 800.

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