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Question 4

A triangle and a square have equal perimeters. The lengths of three sides of the triangle are 7.4 cm, 5.7 cm, 6.9 cm. Then area of the square is ______ square cm.

Solution

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The perimeter of the triangle is $$7.4 + 5.7 + 6.9 = 20$$ cm, so the square also has perimeter 20 cm and side $$\frac{20}{4} = 5$$ cm. Its area is $$5^2 = 25$$ square cm.

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