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segitiga = 14×20÷2= 140 cm²
77+140= 217 cm²
5.) FPB= 80
7.) Volume=debit×waktu
=75 dm³/detik×15 detik=1.125 liter
8.) persegi panjang= 7×10= 70 cm²
lingkaran= 22/7×3,5×3,5÷2= 19,25 cm²
70+19,25= 89,25(89,1/4)