Two circles, radii R1 and R2.
In each circle, draw two radii with central angle A.
Prove that the lengths of arc subtended by the same central angle A are proportional to the radii R1, R2.
I want to use the result in an elementary class, but not take it for granted, even though it appears obvious.
In each circle, draw two radii with central angle A.
Prove that the lengths of arc subtended by the same central angle A are proportional to the radii R1, R2.
I want to use the result in an elementary class, but not take it for granted, even though it appears obvious.