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waheguru
I need to prove that A(-12, -5) B(12, 5) and C(-12, 5) Is a right triangle. I know two adjacent angles need to be perpendicular but the slopes are -10/0 and 0/-24 which are not negative reciprocals?
|dw:1364140978728:dw| in right triangle , the circle point will have cordinates that is same as x of one and y of another
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Can you explain with the co-ordinates I have placed because the slopes are not negative reciporicals?
A(-12, -5) B(12, 5) and C(-12, 5) C(-12,5) matches A's x coordinate matches B's y coordinate
Ok, but Im supposed to prove that it is a right triangle by the slopes?
|dw:1364141234813:dw|
you have 3 points, so you can find the slopes of the lines connecting all three. you can also use the points, and the slopes you have found, to find the equations of the lines.
line A to C have infinite slope
which are reciprocal
SO my slopes are acuually negaitve reciporicals? 10/0 and 0/-24
zero slope is horizontal, infinite slope is vertical. if they intersect, then by definition they would be at right angles, yeah?