Answer:
RV = 5, AV = 9
Explanation:
Two secants to a circle from an external point, then
The product of the external part and the whole of one secant is equal to the product of the external part and the whole of the other secant, that is
4(4 + RV ) = 3(3 + 9), that is
16 + 4RV = 3 × 12 = 36 ( subtract 16 from both sides )
4RV = 20 ( divide both sides by 4 )
RV = 5
and AV = 4 + 5 = 9