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∏d, 2∏r

circumference of a circle

∏r2

area of a circle

½(b1+b2)h

area of a trapezoid

lw

area of a rectangle

s2

area of a square

bh

area of a parallelogram

½bh

area of triangle

2s+2b

Perimeter of a rectangle

s1+s2+s3

perimeter of a triangle

4s

perimeter of square