Question

How can you prove a triangle is a right triangle?

1. Use the distance formula to see if at least two sides are congruent.
2. Use the slope formula to see if any sides are perpendicular.
3. Use the distance formula to see if all three sides are congruent.
4. Use the slope formula to see if any sides are parallel.

Answer 1

Number 2 would be the correct answer

Answer 2

Your answer would be option 2. Use the slope formula to see if any sides are perpendicular. This is because a right triangle must have 2 perpendicular sides that form a 90° angle for it to be a right triangle, so finding these would prove it.
I hope this helps!