Ex: Given the circle: and point B(m,n) is on the circle,prove that the inscribed angle:
Find the coordinates of points“A” and “C”
ABC = 90° if the lines AB & BC
Slopes are negative reciprocals!!
Since point B(m,n) is on the circle
then it must satisfy the equation
Multiply the slopes of the twolines. If they are neg. recip. theproduct will be -1
The product of their slopes is -1,therefore the lines are perpendicular