Geometry EssentialsHESI A2 cheat sheet

Perimeter, area, volume

8 key facts Reviewed Oct 2026

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Perimeter

Add all sides; circle uses C = 2πr

Area

Rectangle l × w
triangle ½bh
circle πr²

Volume

Box lwh
cylinder πr²h
prism = base area × height

Units

Length plain, area squared, volume cubed

Key takeaway

Perimeter, area, volume

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