Back to Derive triangle area formula — Problem 2 · Task Set 22

Exercises: Derive the Formula A = (1/2)ab sin(C)

Grade 10·21 problems·~30 min·Common Core Math - HS Geometry·standard·hsg-srt-d-9

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Recall / Warm-Up

In a right triangle, an acute angle is $\theta$ . The side opposite $\theta$ has length $h$ and the hypotenuse has length $a$ . Which equation is correct?

$\sin(\theta) = \dfrac{a}{h}$

$\sin(\theta) = \dfrac{h}{a}$

$\sin(\theta) = \dfrac{h}{a^2}$

$\cos(\theta) = \dfrac{h}{a}$