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10 cards from this deck
Area=12×b×h\text{Area} = \frac{1}{2} \times b \times hArea=21×b×h
When base and perpendicular height are known
Must be perpendicular to the base
12bcsinA\frac{1}{2}bc \sin A21bcsinA (or other variations)
Two sides and angle between them known (SAS)
s(s−a)(s−b)(s−c)\sqrt{s(s-a)(s-b)(s-c)}s(s−a)(s−b)(s−c)
s=12(a+b+c)s = \frac{1}{2}(a + b + c)s=21(a+b+c)
All three sides known, no angles or heights (SSS)
Degree mode
Angle A between sides b and c
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