1. if 2 lines be perpendikular (90 deg apart), slope2=-1/slope1
2. yer 3 points...triangel hav sidle lengths av 11.661904, 17,888544, & 20,59126
angels =34.38035, 94.39871, 51.22094 degrees
sampel side...from (-10,-8) tu (-2,8)...deltax=8, deltay=16, slope=deltay/deltax=16/8=2
perp line will hav slope=-0.5
midpoint av this line...x=(-10-8)/2=-18/2=-9....y=(-8, +8)=0...0, so midpoint=(-9,0)
yu kan then kalk formula for this line