Question
A rectangle has a length of 42 m and a breadth of 3r m. Find
  1. its area in terms of r,
  2. its perimeter in terms of r,
  3. the area of the rectangle if r = 3.
4 m
(a)

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(b)

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(c)

Click button first when a symbol is required. X

A rectangle has a length of 42 m and a breadth of 3r m. Find
  1. its area in terms of r,
  2. its perimeter in terms of r,
  3. the area of the rectangle if r = 3.