3 years ago

AB is tangent to circle O at B. What is the length of the radius r? Round to the nearest tenth.

1 answer:

3 0

$Use\ Pythagorean\ theorem.\\\\r^2+10^2=11.7^2\\\\r^2+100=136.89\ \ \ \ |subtract\ 100\ from\ both\ sides\\\\r^2=36.89\\\\r=\sqrt{36.89}\\\\r\approx6.1\\\\Answer:\boxed{C.\ r=6.1}$

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