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Question Number 9100 by arinto27 last updated on 18/Nov/16
luas segi 6 beraturan dgn panjang   sisi 10 cm adalah...?
$$\mathrm{luas}\:\mathrm{segi}\:\mathrm{6}\:\mathrm{beraturan}\:\mathrm{dgn}\:\mathrm{panjang}\: \\ $$$$\mathrm{sisi}\:\mathrm{10}\:\mathrm{cm}\:\mathrm{adalah}…? \\ $$$$ \\ $$
Answered by sandy_suhendra last updated on 20/Nov/16
segi 6 beraturan terdiri dr 6 segitiga sm sisi  luas segitiga sm sisi=(1/4)s^2 (√3) = (1/4)×10^2 (√3) = 25(√3) cm^2   luas segi 6 = 6×luas segitiga=6×25(√3)=150(√3) cm^2
$$\mathrm{segi}\:\mathrm{6}\:\mathrm{beraturan}\:\mathrm{terdiri}\:\mathrm{dr}\:\mathrm{6}\:\mathrm{segitiga}\:\mathrm{sm}\:\mathrm{sisi} \\ $$$$\mathrm{luas}\:\mathrm{segitiga}\:\mathrm{sm}\:\mathrm{sisi}=\frac{\mathrm{1}}{\mathrm{4}}\mathrm{s}^{\mathrm{2}} \sqrt{\mathrm{3}}\:=\:\frac{\mathrm{1}}{\mathrm{4}}×\mathrm{10}^{\mathrm{2}} \sqrt{\mathrm{3}}\:=\:\mathrm{25}\sqrt{\mathrm{3}}\:\mathrm{cm}^{\mathrm{2}} \\ $$$$\mathrm{luas}\:\mathrm{segi}\:\mathrm{6}\:=\:\mathrm{6}×\mathrm{luas}\:\mathrm{segitiga}=\mathrm{6}×\mathrm{25}\sqrt{\mathrm{3}}=\mathrm{150}\sqrt{\mathrm{3}}\:\mathrm{cm}^{\mathrm{2}} \\ $$

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