Question

HELP!!!! The measure of side BC =

Answer 1

Answer:

D

Step-by-step explanation:

Using the cosine ratio and the exact value

cos45° = $\frac{\sqrt{2} }{2}$ , then

cos45° = $\frac{adjacent}{hypotenuse}$ = $\frac{BC}{AC}$ = $\frac{BC}{n}$ = $\frac{\sqrt{2} }{2}$ ( cross- multiply )

2BC = n$\sqrt{2}$ ( divide both sides by 2 )

BC = $\frac{n\sqrt{2} }{2}$ → D