Question from Janie, a student:

I'm having trouble with this question.

Find the radius of a circle knowing that a chord of 24.6 inches has a corresponding arc of 70°.

If someone could help me out with this it would be much appreciated.

Hi Janie,

Look at the triangle $ABC.$ What trig function relates 12.3 inches, $r$ inches and $35^o?$

Penny