Matematika

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Tolong bantu dong nomer 20 ... Please ... Dgn caranya !!!!!
Tolong bantu dong nomer 20 ... Please ... Dgn caranya !!!!!

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  • DE = √15² - 9²
    = √225 - 81
    = √144
    = 12cm

    K = AB + BC + DC + DE + EA
    = 15 + 10 + 9 + 12 + 10
    = 56cm

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