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Perimeter = 29 cm so each side is 7.25 cm.

The triangle formed by the diagonal and two sides has sides of 7.25, 7.25 and 11.8 cm so, using Heron's formula, its area is 24.9 square cm.

Therefore, the area of the rhombus is twice that = 49.7 square cm.

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Is the diagonals of rhombus congruent?

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