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Which covers more ground: a circular lawn of radius 21 m or a square lawn of side 37 m? Use π = .

Class 7Perimeter and AreaPerimeter and Area
  • AThe square, by
  • BThe circle, by
  • CThey cover exactly the same ground
  • DThe circle, by

Step-by-Step Solution

Circle = . Square = . The circle wins by — too close to guess, so both areas must actually be computed. (132 m is the circle's circumference, not its area.)
Answer: D) The circle, by

Key idea: Parallelogram area

**Area of a parallelogram = base × height.**

Same idea as a rectangle, but the height is the perpendicular distance between the two parallel sides — NOT the slant length of the side. Pick any side as the base, drop a perpendicular to the opposite parallel side, measure that — that's the height.

Example: parallelogram with base 8 cm and perpendicular height 5 cm. Area = . The slant side could be longer; doesn't matter for area.

Perimeter of a parallelogram = 2 × (one side + adjacent side).

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