Question

Find the Cos. please help.

Answer 1

`cos(C)=\frac{√(1,353)}{{41}}`

Explanation:

step 1

In the right triangle CDE find the length side of the hypotenuse, aoolying the Pythagoras Theorem

`DC^(2)=4^(2)+(√(66))^(2)\\ \\DC^(2)=82\\ \\DC=√(82)\ units`

step 2

Find the cos(C)

`cos(C)=(√(66))/(√(82))=(√(33))/(√(41))=\frac{√(1,353)}{{41}}`