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10 cards from this deck
Amount of 2D space within boundary of flat shape
Square units (cm², m², km²)
s2s^2s2 where sss = side length
b×hb \times hb×h where bbb = base, hhh = height
12b×h\frac{1}{2}b \times h21b×h where bbb = base, hhh = perp. height
12(a+b)×h\frac{1}{2}(a + b) \times h21(a+b)×h where aaa, bbb = parallel sides
b×hb \times hb×h where bbb = base, hhh = perp. height
πr2\pi r^2πr2 where rrr = radius
Height must be perpendicular (90°) to the base
≈ 0.01 km²
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