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panjang = 9 cm
lebr = 5 cm
LP = 258 cm²
maka :
LP = 2 x (pxl + pxt + lxt)
258 = 2 x (9x5 + 9xt + 5xt)
258 = 2 x (45 + 9t + 5t)
258 = 2 x (45 + 14t)
258 = 90 + 28t
28t = 258-90
t = 168/28
t = 6 cm
jadi :
V = 9 x 5 x 6
= 270 cm³