Question

What is the value of x?

Answer 1

D

Explanation:

Using the sine ratio or the cosine ratio in the right triangle.

Choosing the sine ratio with the exact value

sin45° =
`(√(2) )/(2)` , then

sin45° =
`(opposite)/(hypotenuse)` =
`(x)/(10)` =
`(√(2) )/(2)` ( cross- multiply )

2x = 10
`√(2)` ( divide both sides by 2 )

x = 5
`√(2)` → D

Answer 2

look at the picture I have sent