Matematika

Pertanyaan

No.39
*tolong dibantu
No.39 *tolong dibantu

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  • Keliling = 2 (10 + x)
    54 = 2 (10 + x)
    10 + x = 27
    x = 17

    jadi panjang KL = LM = 17 cm

    cari panjang OK
    OK = √KL²-OL² = √17²-15² = √289-225 = √64 = 8 cm

    cari panjang ON
    ON = √KN²-OK² = √10²-8² = √100-64 = √36 = 6 cm

    panjang KM = 2 x OK = 2 x 8 = 16 cm
    panjang LN = OL + ON = 15 + 6 = 21 cm

    Luas layang2 = 1/2 x KM x LN = 1/2 x 16 x 21 = 168 cm² (A)

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