Question

Find the distance between the points (–1, –2) and (8, 4)

A. 3 times the square root of 5
B. 3 times the square root of 13
C. The square root of 30
D. 13 times the square root of 3

Answer 1

By the Pythagorean theorem
.. d = √((8 -(-1))^2 +(4 -(-2))^2) = √117
.. d = √(9*13) = (√9)*(√13)
.. d = 3√13

Selection B is appropriate.