A circular pond has an area equal to 616 m2. A circular stage is made ...
Let the radius of the pond be R metres.
Then, πR2 = 616 → R2 = 616 × 7 / 22 = 196 → R = 14 m.
Radius of the stage = (14 / 2) m = 7 m.
Area where water is present
= π (142 - 72) = (22/7 × 21×7) m2
= 462 m2.
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A circular pond has an area equal to 616 m2. A circular stage is made ...
Let the radius of the pond be R metres.
Then, πR2 = 616 → R2 = 616 × 7 / 22 = 196 → R = 14 m.
Radius of the stage = (14 / 2) m = 7 m.
Area where water is present
= π (142 - 72) = (22/7 × 21×7) m2
= 462 m2.
A circular pond has an area equal to 616 m2. A circular stage is made ...
Given information:
- The area of the circular pond is 616 m².
- The radius of the circular stage is half the radius of the pond.
To find: The area where water is present.
Solution:
1. Calculate the radius of the pond:
- The area of a circle is given by the formula A = πr², where A is the area and r is the radius.
- Given that the area of the pond is 616 m², we can rearrange the formula to solve for the radius: r = √(A/π).
- Substituting the given area, we have r = √(616/π).
- Evaluating this, we find that the radius of the pond is approximately 14 m.
2. Calculate the radius of the stage:
- The radius of the stage is half the radius of the pond.
- Therefore, the radius of the stage is 14/2 = 7 m.
3. Calculate the area of the stage:
- The area of a circle is given by the formula A = πr², where A is the area and r is the radius.
- Substituting the given radius, we have A = π(7)².
- Evaluating this, we find that the area of the stage is approximately 154 m².
4. Calculate the area where water is present:
- The area where water is present is equal to the area of the pond minus the area of the stage.
- Substituting the given areas, we have area of water = 616 - 154.
- Evaluating this, we find that the area where water is present is 462 m².
Therefore, the correct answer is option B) 462 sq. m.