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108 cm = 18 cm × t ÷ 2
216 cm = 18 cm × t
t = 216 cm ÷ 18 cm
t = 12 cm
Sisi miring = √(12² + 9²)
Sisi miring = √(144 +81)
Sisi miring = √225
Sisi miring = 15 cm
Keliling = Sisi miring + Alas + Sisi miring
Keliling = 15 cm + 18 cm + 15 cm
Keliling = 48 cm *B*