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240 cm2 = 30 cm . d2 : 1/2
240cm2 = 15d2
d2 = 240cm2/15cm
d2 = 16 cm
sisi = √15 kuadrat + 8 kuadrat
sisi = √225 + 64
sisi = √289
sisi = 17 cm
keliling = 4 . s
keliling = 4 . 17 cm
keliling = 68 cm
L =1/2.d1.d2
240=1/2.30.d2
240=15.d2
16=d2
kell :
sisi= 17 cm (diperoleh dari penjumlahan akar kuadrat dari 8 kuadarat+15 kuadrat)
kell= 4.17=68 cm