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Help...I not understand

Help...I not understand-example-1

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2a + 2b = The perimeter. You know one side (5cm) and the total perimeter (30cm)So your equation should be 2(5) + 2(b) = 30. From here you simply solve for "b" 2(b) = 30 -10 2(b) = 20 b = 20/2 b is equal to 10cm.


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