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area of a parallelogram

b×h

area of a square

s²

area of a triangles

½ b×h

area of a trapezoid

½h (b₁+b₂)

area of a circle

r² π

circumference of a circle

dπ or 2πr

perimeter of a square

4s

perimeter of a parallelogram

2b+2h

perimeter of any non circular figure

s+ however many sides