Question

I need help ASAP please

Answer 1

B

Explanation:

Using the cosine ratio in the right triangle and the exact value

cos45° =
`(1)/(√(2) )` , then

cos45° =
`(adjacent)/(hypotenuse)` =
`(3)/(c)` =
`(1)/(√(2) )` ( cross- multiply )

c = 3
`√(2)`