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Skill 7 of 13
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Mathematical skill ●●●○○

2D shapes have area and 3D shapes volume.1 How do we find these areas and volumes for different shapes? It turns out that they can be calculated if we happen to have a formula2 for them. A formula is a “recipe” for finding the actual values of properties like area or volume. Here are some formulas:

Area and volume of shapes
CircleA=\pi r^2BallV=\frac13\pi r^3
TriangleA=\frac12 h lPyramidV=\frac13 h A_\text{base}

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  1. Online Etymology Dictionary’ (dictionary), Douglas Harper,