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12×5/2=30
bangun 2=persegi panjang=p×L=10×12=120
bangun 3 segitiga siku²=Triple pitagoras=alas=2 tinggi=10 =a×t/2
2×10/2=10
bangun 4 segitiga siku²=alas= 2 tinggi=10
at/2=2×10/2=10
jadi=30+120+10+10=170 cm
maaf satu dulu nanti dilanjut