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The perimeter of a rectangle is 12 cm and it’s breadth is 2 cm. What will be it’s length?(a) 2 cm(b) 3 cm(c) 4 cm(d) 5 cmI had been asked this question in class test.The query is from Solving Linear Equations with Variables on Both the Sides in portion Linear Equations in One Variable of Mathematics – Class 8

Answer»

Right answer is (b) 3 CM

To explain I WOULD say: For any rectangle the formula for perimeter is 2 × (Length + Breadth). Here we already KNOW the breadth of the rectangle. When we substitute the known VALUES in the formula for perimeter of a rectangle we get,

12 = 2 × (Length + 2)

∴ 6 = Length + 2

∴ Length = 4 cm.



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