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Luas segi-n beraturan=n/2 . R^2 . sin360/n
segi-8=8/2 . 6^2 . sin 360/8
=4 . 36 .sin45
=144 . 1/2 akar 2
=72 akar 2
r = 6
sudut pusat sg 8 =360/8= 45
Luas segi 8 = 8 x luas segitga (dgn sisi 6 , sdt 45)
L = 8 x {1/2 x r x r sin 45}
L = 8 x 1/2 x 6 x 6 x 1/2 √2
L = 4 x 36 x 1/2 √2
L = 72 √2