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panjang sisi sejajar = 9 cm
sisi miring = 13 cm
maka :
(Theoreme Phytagoras)
t² = 13²-5²
t² = 169 - 25
t = √144
t = 12 cm
L = (a+b)xt /2
= (9+9)x12 /2
= 18x12 / 2
= 216/2
= 108 cm²