tolong ya.... soalnya aku gak tauuu

(1). L1=1/2×6×3=1/2×18=9cm2
L2=1/2×6×3=1/2×18=cm2
L=9+9=18cm2
(2).L1=1/2×22/7×7×7=1/2×154=77Dm2
L2=1/214×4=1/2×56=28dm2
L=77+28=105dm2
(3). L1=21×21=441Dm2
L2=1/4×22/7×21×21=1/4×1386=3645dm2
L=441+364,5=94,5dm2
Maaf**kalo**salah