Understanding to calculate circumference, radius and area of a circle.

Mapped to CCSS Section# 7.G.B.4, 5.G.A.2

Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.,Represent real world and mathematical problems by graphing points in the first quadrant of the coordinate plane, and interpret coordinate values of points in the context of the situation.
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