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without using the pythagorus theorem show that the points(4,4),(3.5)and (-1,-1) are the vertices of a right angled triangle |
| Let A(4,4), B(3,5) and C(-1,-1) are the points. slope of AB=-1 slope of AC = 1 Their product = -1 Hence AB and AC are perpendicular. Thus ABC is a right triangle. |
