Geometric Figures

Area of a circleD2 x 0.7854 = π r2 (r = radius)
Circumference of a circleπ D or 2π r
Area of a sphereπ D2 - 4π r2 (D + diameter)
Area of a triangle1/2 altitude x base
Volume of a conearea of base x 1/3 alititude
Area of a trapezoid1/2 (sum of parallel sides) x altitude
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