Given: two concentric circles with ab tangent to smaller circle at r
prove: ar=rb

See explanation

Step-by-step explanation:

If segment AB is tangent to the smaller circle, than AB⊥OR. Consider two right triangles AOR and BOR. In these triangles:

By HL theorem, ttriangles AOR and BOR are congruent. This gives you that AR=RB.

4

step-by-step explanation:

im pretty sure it's 4 beacsue 8/2 equals 4