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10 cards from this deck
A=lwA = lwA=lw (length × width)
A=12bhA = \frac{1}{2}bhA=21bh (half base × height)
A=bhA = bhA=bh (base × vertical height)
A=12(a+b)hA = \frac{1}{2}(a + b)hA=21(a+b)h (avg parallel sides × height)
Perpendicular distance from base to opposite vertex/side
Using slanted side instead of perpendicular height
Mixing units causes errors; must use same unit throughout
cm2\text{cm}^2cm2 (square centimeters)
Triangle area is exactly half the rectangle area
Not given; must memorise all formulae
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