Question

A circle has center at (1, 2). One point on its circumference is (-3, -1). What is the radius of the circle?

Answer 1

Step-by-step explanation:

Equation of circle is (x-h) ^2 + (y-k) ^2 = r^2

= (-3-1) ^2+(-1-2)^2= r^2

= (-4)^2+(-3)^2= r^2

= 16+9= r^2

= r^2 =25

r =5

Hence radius will be 5 units