Question

determine if the triangle with the following vertices is a right triangle.
A(-3, 5), B(1, 4), and C(-1, 0).

Answer 1

Use the point-slope form of a line between two points to determine if they are perpendicular (ie, intersect at a 90 degree angle).

The point-slope form is:\[y = y1 + [(y2 - y1) / (x2 - x1)]·(x - x1)\] where \[(y2 - y1) / (x2 - x1)\] is the slope.

Answer 2

Remember two lines are said to be perpendicular if their slopes are negative inverse of each other. For example, m1 = 1/2 and m2 = -2