The area of a square is 81 cm². Its perimeter is:
- A.18 cm
- B.27 cm
- C.36 cm ✓
- D.40 cm
Explanation: Side = √81 = 9 cm. Perimeter = 4×9 = 36 cm.
Class 6 IMO Mathematics Olympiad practice · Geometry & Spatial Thinking · Perimeter & Area
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