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b = 18 cm
c = 15 cm
s = 1/2 × K
= 1/2 × (a + b + c)
= 1/2 × (15 + 18 + 15)
= 1/2 × 48
= 24
La =
=
=
=
= cm²
Lp = 2(La) + (Ka × t)
= 2(108) + (48 × 6)
= 216 + 288
= 504 cm²
Jadi jawabannya adalah yang b. 504 cm²