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Diketahui segi-8 beraturan dengan panjang sisi 8 cm. Luas segi-8 tersebut adalah ...

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Segi-8 terdiri dari 8 segitiga beraturan.

$angle A O B equals fraction numerator 360 degree over denominator 8 end fraction equals 45 degree L. A O B equals 1 half a. b. sin O space space space space space space space space space space space space equals 1 half 8.8. sin 45 degree space space space space space space space space space space space space equals fraction numerator 1 over denominator up diagonal strike 2 end fraction up diagonal strike 8 to the power of 4. up diagonal strike 8 to the power of 4. fraction numerator 1 over denominator up diagonal strike 2 end fraction square root of 2 space space space space space space space space space space space space space equals 16 square root of 2 space c m squared L u a s space s e g i minus 8 colon space 8 x 16 square root of 2 equals 128 square root of 2 space c m squared$