The expression x = √(20² - 7²) can be used to determine the side length of side AC option (d) is correct.
What is a right-angle triangle?
It is a triangle in which one of the angles is 90 degrees and the other two are sharp angles. The sides of a right-angled triangle are known as the hypotenuse, perpendicular, and base.
We have:
Triangle ABC is a right triangle with sides shown in the figure.
From the Pythagoras theorem:
20² = 7² + x²
x² = 20² - 7²
x = √(20² - 7²)
Thus, the expression x = √(20² - 7²) can be used to determine the side length of side AC option (d) is correct.
Learn more about the right angle triangle here:
brainly.com/question/3770177
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