Helping students gain understanding and self-confidence in algebra.
descartes123 wrote:prove that the triangle with its summits P(-2,-1), Q(6,1) and R(3,4) is right-angle.
descartes123 wrote:The thing is that in this case we have to use a formula, describing a distance between to points.
let's say if we have two points M1(x1,y1) and M2(x2,y2). and you have to use a distance formula.