ACT 2021 April(D05) Math Question 37 Explanation - ACT Helper

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2021 April(D05) Math Question 37
Trigonometry
- Pythagorean Theorem & sin cos tan
Pythagorean Theorem and Special Right Triangles, Trigonometry for Right Triangles
Choice D
$J L = \sqrt{9^{2} + 7^{2}} = \sqrt{130}$
$∴ c o s K J L = \frac{K J}{J L} = \frac{9}{\sqrt{130}}$
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