**Circumference of Circles**

Circumference of a circle is the length of the arch-forming circle.** **How to calculate the circumference of a circle? Suppose, given a circle made of wire. Circumference can be calculated by measuring the length of wire that form the circle.

Circumference formula

C = ? d atau C = 2 ? r

Explanation : C = Circumference

? = phi

d = diameter

r = radius

**Area of Circles**

Area of circle represents the area bounded by the circumference of a circle. Area of a circle can be calculated using the general formula area of a circle.

Area formula

A = ΒΌ ? d^{2 }atau A =? r2

Explanation :* *A =Area

? = phi

d = diameter

r = radius

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