circle and radius

Question

The points

​(−6​,−2​)

and

​(3​,6​)

are the endpoints of the diameter of a circle. Find the length of the radius of the circle.

Answer 1

The radius of the circle will be half of the diameter. Using the distance formula for the 2 points:

The diameter = sqrt{ (6+2)² + (3+6)²) } = 12.042

So,

The radius = 12.042/2 = 6.021