The equation tan-1(8.5/7.7) = x can be used to find the measure of angle lkj

Given equation :

We know the formula,

can be written as

In the given problem angle theta is taken by x and fraction a/b is taken by 8.5/7.7.

In order to find the value of tan^-1(8.5/7.7), we need to put arc tan or tan^-1(8.5/7.7) in calculator.

By default, calculator would give angle in radians.

Also if you want answer in degrees, please do not forget to change the radian key(button) into degrees.

On putting  tan^-1(8.5/7.7) in calculator, we get 0.834741.. radian approximately.

And in degrees it would be 47.827 degrees approximately.

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answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8