Find the length of x in the 45 degree, -45 degree, -90 degree triangle. Show work

asked Aug 5, 2023 35.6k views

6 votes

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8 votes

Answer:

Option A

Explanation:

Given:

$\sf \therefore \: cos \: 45 \degree = (base)/(hypotenuse) = (9)/(x)$

$\sf \cos(45 \degree) = (1)/( √(2) )$

$\sf (1)/( √(2) ) = (9)/(x)$

$\therefore \: \rm \: x = 9 √(2)$

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