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A. 45.7

Step-by-step explanation:

The degree measures of a triangle add up to 180°.

One of the angles equal 90°. 90 divided by 2 equals 45.

45.7 is the closest to 45

Explanation:

Apply the tangent ratio and inverse tangent function (aka arctangent) to get the following

tan(angle) = opposite/adjacent

tan(x) = 8/7.8

x = arctan(8/7.8)

x = 45.7252242990592

x = 45.7

Be sure that your calculator is in degree mode.

the answer is d

step-by-step explanation:

you can also use mathway to get you answer + steps