Then PD=24-t

CQ=3t

Parallelogram:

PD=CQ

So 24-t=3t

t=6

Isosceles trapezoid:

Because BC-AD=2

So if you want to be an isosceles triangle,

The bottom is 4 longer than the top.

That is PD+4=CQ.

So 24-t+4=3t.

t=7

15. Take the midpoint g of AB, and connect EG: quadrilateral ABCD as a square ∴∠ B = 90 ∴∠ BAE +∞ BEA = 90 because AE?ef∴∠bea+∞. Because CF is the bisector of the outer corner of ∠DCB, DFC = 45, ECF = 90+45 = 135, AE=EF agrees with 0| comment.