Home » P(-6, 1) and Q(6, 6) are the two ends of the diameter of a given…

P(-6, 1) and Q(6, 6) are the two ends of the diameter of a given…

P(-6, 1) and Q(6, 6) are the two ends of the diameter of a given circle. Calculate the radius.

A.
6.5 units
B.
13.0 units
C.
3.5 units
D.
7.0 units

Correct Answer: Option A

Explanation

PQ² = (x₂ – x₁)² + (y₂ – y₁)²
= 12² + 5²
= 144 + 25
= 169
PQ = √169 = 13
But PQ = diameter = 2r, r = PQ/2 = 6.5 units