Intro to Perpendicular Bisector
What's interesting about DA and BD?
Move point D up and down the perpendicular bisector. Are segment DA and BD still congruent regardless of the location of point D on the perpendicular bisector?
What type of triangle is triangle ADB? (hint: look at its sides)
Can we make any conclusios/statements about angles A & angle B? If yes, what conclusion/statement can we make? If no, then why not?