Question

What is the radius of a circle if its center is (-3,-2) and one point on the circle is (5,-2)?

Answer 1

Answer:

A

Step-by-step explanation:

The distance from the centre to a point on the circle is the radius.

Calculate radius r using the distance formula

r = √ (x₂ - x₁ )² + (y₂ - y₁ )²

with (x₁, y₁ ) = (- 3, - 2) and (x₂, y₂ ) = (5, - 2)

r = $\sqrt{(5+3)^2+(-2+2)^2}$

  = $\sqrt{8^2+0^2}$

  = $\sqrt{64}$ = 8 → A