The larger angles of a rhombus are twice the smaller angle of the rhombus. If the shorter diagonal is 20, find the perimeter of the rhombus.

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  1. If you draw the rhombus, you will see that the angles are 60° and 120°.

    Since the diagonals bisect the angles, the shorter diagonal forms two equilateral triangles.

    So, each side is 20, and the perimeter is 80.

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  2. A rhombus has 240cm

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