The area \( A \) of a circle is given by the formula:

\[
A = \pi r^2
\]

Where:
- \( A \) is the area,
- \( r \) is the radius of the circle,
- \( \pi \) (pi) is a constant approximately equal to 3.14159.

### Example:
If the radius of a circle is 5 units, the area would be:

\[
A = \pi \times 5^2 = \pi \times 25 \approx 78.54 \text{ square units}.
\]

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### Related Questions:
1. How do you calculate the area of a sector of a circle?
2. What is the relationship between the diameter and the area of a circle?
3. How do you derive the formula for the area of a circle?
4. Can you find the area of a circle if only the circumference is known?
5. What is the difference between the area of a circle and the surface area of a sphere?

**Tip:** Remember that the diameter of a circle is twice the radius, so you can easily find the radius if the diameter is given.

Learn how to calculate the area of a circle using the formula A = πr^2. This example demonstrates finding the area when the radius is given, and includes key geometry concepts suitable for Grades 6-8 students. Example provided with radius 5 units, resulting in an area of approximately 78.54 square units.

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