Jawabanmu

2014-05-20T20:27:40+07:00
K = jumlah seluruh sisi
68 = 4 (3x + 8)
68 = 12x + 32
68 - 32 = 12x
    36    = 12x
     x     = 3
sisi = 3 x 3 + 8 = 17 cm

17² = 15² +1/2d2
289 = 225 + d2
289 - 225 = 1/2d2
√64         = 1/2
1/2d2       = 8 cm
d2          = 2 x 8 = 16 cm

L = 1/2 × d1 × d2
L = 1/2 x 30 x 16
L = 15 x 16 = 240 cm²


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