a=5, b=7, h=4
24.00 cm^2
a=10, b=6, h=3.5
28.00 mm^2
a=2.5, b=3.5, h=1.2
3.60 m^2
a=12, b=8, h=5
50.00 cm^2
a=3, b=3, h=3
9.00 dm^2