A straight line passes through the point P(1,2) and Q
(5,8). Calculate the length PQ
(5,8). Calculate the length PQ

A.
(4sqrt{11}) 
B.
(4sqrt{10}) 
C.
(2sqrt{17}) 
D.
(2sqrt{13})
Correct Answer: Option D
Explanation
PQ = (sqrt{(x_2 – X 1) + (y_2 – y_1)^2})
= (sqrt{(5 – 1)^2 + (8 – 2)^2})
= (sqrt{4^2 + 6^2})
= (sqrt{16 + 36})
= (sqrt{52})
= 2(sqrt{13})