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bh

Area of a parallelogram

∏r²

Area of a circle

½h(b₁+ b₂)

Area of a trapezoid

2( l+ w) or 2l + 2w

Perimeter of a rectangle

4s

Perimeter of a square

½bh

Area of a triangle

2∏r or ∏d

Circumference of a circle

s²

Area of a square