Question

Does Anyone know #19?

Answer 1

`\text{Endpoints of diameter,}~~ A(4,6)~ \text{and}~ B(-3,-1)\\\\\text{Diameter,}~AB = √((4+3)^2+(6+1)^2)\\\\~~~~~~~~~~~~~~~~~~~=√(7^2+7^2)\\\\~~~~~~~~~~~~~~~~~~~=7\sqrt2\\\\\text{So , radius}~ = \frac{AB}2 = \frac{7\sqrt 2}2 =4.9~\text{units.}\\\\\text{Hence the answer is B.}`