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luas = 20 × 20 = 400
luas bangun 2 = P × L
luas = 120 × 42 = 5040
maka luas bangun 1 + bangun 2 = 400 + 5040 = 5440
keliling bangun 1 = 4 × sisi
keliling = 4 × 20 = 80
keliling bangun 2 = 2 ( P + L )
keliling = 2 × ( 120 + 42 ) = 282
maka keliling bangun 1 + bangun 2 = 80 + 282 = 362
# maaf y kalau salah