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luas persegi1=5×5=25cm2
luas persegi 2=5×5=25cm2
luas daerah yang diarsir=280-25-25=230cm2
Keliling daerah yang diarsir=
(20-5)+(14-5)+5+5+(20-5)+(14-5)+5+5=68cm
Luas = 14 x 20 - 2 (5 x 5) = 280 - 50 = 230 cm²
b. keliling = 2 (4 + 8 + 8 + 12) = 2 (32) = 64 cm
Luas = (4 x 8) + (12 x 4) + (8x 4) = 32 + 48 + 32 = 112 cm²