Question

If point a is at (-1,2) and point b is at (11,-7), what is length of line ab?

Answer 1

15

Explanation:

Distance formula:
`d=\sqrt{(x2-x1)^(2)+(y2-y1)^(2) }`

Plug in (-1,2) and (11, -7):

`d=\sqrt{(11-(-1)^(2)+(-7-2)^(2) } = d=\sqrt{(12)^(2)+(-9)^(2) }=√(144+81) = √(225) = 15`