Almost afraid to see what the Q's will bring us to work with. Here we go:

(2)quack, quadrangle, quadrant, quadrilateral... OMG!

I have a friend who calls himself Doc Mac,
but he's nothing more than a quack.
He gives out a useless diagnosis, a cure he does lack,
His finding are as silly as a duck speaking in quack.

From here I can't see the right angle,
of the area encased by the quadrangle.

Hold up the map to the planes pilot to see,
so he can use the quandrant to find the right spot.

He needs to see how he's flying, are we topsy turvy,
or is he quadrilateral and should we worry?