Find the type of triangle $A B C$ formed whose vertices are $\mathrm{A}(1,0), \mathrm{B}(-5,0)$ and $\mathrm{C}(-2,5)$.
Explanation
The triangle ABC is a right-angled triangle because the slope of the line AB is 0, which means it is parallel to the x-axis, and the slope of the line BC is 5/3, which is not equal to 0, so the angle between AB and BC is a right angle.
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