The equilateral triangle shown has perimeter 45 cm. How to find its side length?

Multiplying an even number of negative numbers gives an answer that is choose from:

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

Can anyone me with 32,33,36,37,and 40.