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Area of a Circle

A =π (r)²

Area of a parallelogram

A= b h

Area of a trapezoid

A = 1/2 h (b1 + b2)

Area of a triangle

A= 1/2 bh

Circumference of a Circle with diameter

C = π d

Circumference of a Circle with radius

C= 2 π r

π

3.14