Prove that the points (2,-2),(-2,1)and(5,2) are the vertices of a right angled triangle

Prove that the points (2,-2),(-2,1)and(5,2) are the vertices of a righ

1.	Prove that the points (2,-2),(-2,1)and(5,2) are the vertices of a right angled triangle
Answer» use the Pythagoras theorem and uae distance formula