Area of common shapes

Each formula counts unit squares.

Geometry and Trigonometry: Area, circles and volume

A_{triangle} = \frac{1}{2} bh

A_{circle} = π r^{2}

Work through it

$\frac{1}{2} (10) (6) = 30$

$r = 4$

$A = 16 π$

Using the diameter in $π r^{2}$ .

Cut the diameter in half first.

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