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Rani writes the rule for a rectangle's perimeter as 2l + b. She tests it on a 5 cm × 3 cm rectangle. What does this show?

Class 6Rules and Formulas with VariablesAlgebra
  • AHer rule is correct
  • BIt gives 16 cm, as it should
  • CIt gives 15 cm, the area
  • DIt gives 13 cm; true is 16 cm

Step-by-Step Solution

, but going round: 5 + 3 + 5 + 3 = 16 cm. She counted the breadth only once; the correct rule is .
Answer: D) It gives 13 cm; true is 16 cm

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