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120 = (5 cm + 5cm) × d2 ÷ 2
120 = 10cm x d2 ÷ 2
120 = 5cm × d2
d2 = 24cm
keliling = sisi miring segitiga
pitagoras =
5 kuadrat + 12 kuadrat = sisi miring kuadrat
25 + 144 = sisi miring kuadrat
169 = sisi miring kuadrat
sisi miring = 13cm
keliling = sisi miring × 4
= 13cm × 4 = 52cm
d2=120/(10/2)=120/5=24
sisi=√(d1 x d1)+(d2 x d2)
=√10 pangkat 2+24 pangkat 2
=√100+576
=√676
=26
keliling=4x26=104
S'MOGA BERMANFAAT