Question

43. Find the value of x.
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Answer 1

Explanation:

when a line is tangent to the radius of a circle, it is 90 degrees so this is a right triangle. Pythagorean theorem

(18+x)^2 = 900 + x^2

x^2+36x + 324 = 900 + x^2

36x + 324 = 900

36x = 576

x = 16