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geometry

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A sign is in the shape of a rhombus with a 60° angle and sides of 9 cm long. Find its area to the nearest tenth

  • geometry -

    base * height = 9 * 9 cos 60 = 9*4.5

  • sorry, too quick -

    height = h
    sin 60 = h/9
    h = 9 sin 60
    so
    area = 81 sin 60 = 70.14

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