Sub-topic 1
2026 · National Preliminary
Free
Area of a right triangle from the hypotenuse and one acute angle, $\text{area}=\dfrac14h^2\sin(2\theta)$
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Sub-topic 2
2017 · National Semifinal
Premium
Area of a triangle from two sides and the included angle, $\text{area}=\dfrac12ab\sin\theta$
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