On constructing the altitudes of a triangle, mathopenref only shows how to do two of the sides and for some reason I cannot do the third side. Help???

Question

barrycarter · Answer

The third altitude will cross the point where the other two altitudes meet, if that helps (the crossing point of the three altitudes is called the 'orthocenter'.

anonymous · Answer

Thanks, but I already tried this. It failed, unfortunately.

barrycarter · Answer

Could you show us what you've done so far?

anonymous · Answer

Sorry, my printer is busted. :(