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10 cards from this deck
Size of surface or space inside boundary of 2D shape
Square units: mm², cm², m², km²
Length×Width\text{Length} \times \text{Width}Length×Width
Side2\text{Side}^2Side2 or Side×Side\text{Side} \times \text{Side}Side×Side
12×Base×Perp. Height\frac{1}{2} \times \text{Base} \times \text{Perp. Height}21×Base×Perp. Height
π×radius2\pi \times \text{radius}^2π×radius2
Straight line at 90° angle to another line
radius=diameter÷2\text{radius} = \text{diameter} \div 2radius=diameter÷2
To estimate area of irregular shapes
Break into simpler shapes, calculate each, add together
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