Hitunglah luas bangun datar di bawah ini!

a.
L1 = 30 × 40 = 1200
L2 = 16×21/2 = 168
L total = 1200 + 168 = 1368 cm²

b.
L1 = (40+30)×8/2 = 70×4 = 280
L2 = 16×10/2 = 8 × 10 = 80
L total = 280 + 80 = 360 cm²