Question

Find the radius and diameter of circle A, if the endpoints of the radius

are (-2, -1) and (6,4).

Answer 1

Explanation:

`length \: between \: ( - 2, - 1) \: and \: (6,4) \\ = \sqrt{(x _(1) - x _(2) )² + (y _(1) - y _(2))² } \\ = √(( - 2 - 6)²+ ( - 1 - 4)²) \\ = √(64 + 25) \\ = √(100) \\ = 10 \: units \\ radius = 10 \: units \\ diameter = 2 * radius \\ d = 2 * 10 \\ d = 20 \: units`