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10 cards from this deck
A=12×base×vertical heightA = \frac{1}{2} \times \text{base} \times \text{vertical height}A=21×base×vertical height
A=base×vertical heightA = \text{base} \times \text{vertical height}A=base×vertical height
A=12(a+b)×vertical heightA = \frac{1}{2}(a + b) \times \text{vertical height}A=21(a+b)×vertical height
The perpendicular distance from base to top (not the sloping height)
Using sloping height instead of vertical height
Break into simple shapes, calculate each, add together
Lengths of the two parallel sides
A triangle is half of a parallelogram
Rearrange formula and solve for the unknown variable
Don't double-count areas or miss sections
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