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Area of a triangle
A = 1/2 bh = 1/2 ab sinθ
Area of a circle
A = πr^2
Circumference of a circle
C = 2πr
Area of a sector of a circle
A = 1/2 r2 θ
Arc length of a sector of a circle
s = rθ (θ in radians)
Volume of a sphere
V = 4/3 πr3
Area of a sphere
A = 4πr2
Volume of a cylinder
V = πr2 h
Volume of a cone
V = 1/3 πr2 h
Area of a cone
A = πr sqrt(r2+h2)
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