- A98
- B54
- C44
- D49
Step-by-Step Solution
Total interior grid = . Boundary stones = . Inside .
Answer: D) 49
A square pond has stones placed only along its boundary, one stone per metre, with the corners shared.
If each side is 9 m, the side count uses the square only for the area, but for the boundary you use 4 side - 4.
Using the property that stones would fill the whole square, how many stones lie strictly INSIDE the boundary (not on it)?
Class 8Properties of Square NumbersSquares and Roots
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