Question

A cord is 15 cm long it is 9 cm from the center of the circle what is the radius of the circle

Answer 1

Check the picture below.

`c^2=a^2+b^2\implies c=√(a^2 + b^2) \qquad \begin{cases} c=hypotenuse\\ a=adjacent\\ b=opposite\\ \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{radius}{r}=√(9^2 + 7.5^2)\implies r=√(137.25)\implies r\approx 11.72~cm`