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108 = (21+6) × t per 2
108 = 27×t/2
108 = 13,5t
t = 8
cari sisi miringnya
a² + b² = c²
15² + 8² = c²
225 + 64 = c²
289 = c²
c = √289 = 13
Jadi kelilingnya adalah
13 + 8 + 21 + 6 = 48