In the above puzzle, one number is missing. Use numerical skill to solve the puzzle and find out the missing number.
The missing number is 73
Numbers in the lower rows of polygon=
addition of first digits of the upper polygons appends
difference of second digits of the upper polygons
56=(4+1) append (9-3)
44=(2+2) append (7-3)
73=(4+3) append (5-2)