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23 June, 17:40

Un trapèze a une aire de 39 cm2. Sa grande base

mesure le triple de sa petite base. Sa hauteur

mesure 3 cm.

Trouve les dimensions des bases de ce trapèze.

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  1. 23 June, 21:39
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    A = bh/2

    39 = b*3/2

    39*2 = b*3/2 * 2

    78 = b*3

    78/3 = b*3/3

    26 = b.

    Alors, la grande base est 26 cm et le petit base serait 26/3 = 8.67 cm arrondi.
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