Question

A triangle is graphed in the coordinate plane. The vertices of the triangle have coordinates (–3, 1), (1, 1), and (1, –2).



What is the perimeter of the triangle

Answer 1

Use the distance formula to get the length of the sides.
\[d = \sqrt{(x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2}}\]
AB = 4
AC = 5
BC = 3
4 + 5 + 3 = 12