Question

HELP!!!!
The measure of side BC =

Answer 1

D

Explanation:

Using the cosine ratio and the exact value

cos45° =
`(√(2) )/(2)` , then

cos45° =
`(adjacent)/(hypotenuse)` =
`(BC)/(AC)` =
`(BC)/(n)` =
`(√(2) )/(2)` ( cross- multiply )

2BC = n
`√(2)` ( divide both sides by 2 )

BC =
`(n√(2) )/(2)` → D