Use the coordinate distance formula to determine whether the triangle is a right triangle.?

Question

Given are the coordinates of the vertices of a triangle. Use the coordinate distance formula to determine whether the triangle is a right triangle. 
P (2, 3) 
Q (-2, -3) 
R (-6, 1)

Answer 1

The coordinates are

Distance between two points is

From the pythagorean theorem squre of the hypotenuse is equal to the sum of the squres of the other two sides.

In this case the therom is not applicable.

The triangle PQR is not a right angle triangle.