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10 questions from this quiz
Heron's rule
12×b×h\frac{1}{2} \times b \times h21×b×h
Perpendicular
When 2 sides and angle between known
Sides bbb and ccc
The semi-perimeter
s(s−a)(s−b)(s−c)\sqrt{s(s-a)(s-b)(s-c)}s(s−a)(s−b)(s−c)
Exactly half
The semi-perimeter sss
To match degrees or radians
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