Question

prove that the points (2,-2),(-2,1)and (5,2) are the vertices of a right triangle.also find the area of this triangle.

Answer 1

using distance formula that is under root (x2-x1)^2+(y2-y1)^2 find the three distances and by using Pythagoras theorem u can prove it... then area of triangle =1/2[x1(y2-y3)+x2(y3-y1)+x3(y2-y1)]

use the hints given then it will be easy to do ....