Question

What is the measure of angle B in the figure below?
о 30°
О 45°
О 60°
O90°

Answer 1

45

Explanation:

Answer 2

45°

Explanation:

Using the cosine ratio in the right triangle

cosB =
`(adjacent)/(hypotenuse)` =
`(3)/(3√(2) )` =
`(1)/(√(2) )`, hence

B =
`cos^(-1)`(
`(1)/(√(2) )` ) = 45°