X = A 21.6 B 12.9 C 9.1

Hi there! Use the equation below.

The reason why we use this equation because we know that sinA = opposite/hypotenuse. Here we focus on 57°. Our opposite would be 10.8 and hypotenuse is x. Hence sin57° = 10.8/x

You might need a calculator or a trigonometric table to find the value of sin57°. Note that not all values are exact. They are approximate.

Therefore, sin57° ≈ 0.838.

Rewrite the equation.

Solve the equation for x-term.

Then round up to the nearest tenth. Hence, the value of x is 12.9

Answer

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