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bngun a = p x l
= (42- 13) x 31
= 29 x 31
= 899
bangun b = p x l
= 13 x 21
= 273
luas = 899+273
= 1172 cm²
jawaban soal nomer 2
bangun a = p x l
= (50-14-12) x 18
= 24 x 18
= 432 cm²
bangun b = p x l
= 50 x 41
= 2050
luas = 2050+432
= 2482 cm²