Buzz
1. Formula for calculating the area of a circle
Consider a circle as shown below with a radius denoted by r.
The area of the circle is calculated using the formula:
or
where d represents the diameter of the circle; π is the constant Pi equal to 3.14
Extended formula for a circle
* Circumference of a circle
C = 2r x 3.14 = d x 3.14
Where:
3. Example illustrating the calculation of the area of a circle
- Problem: Calculate the area of the circle above when r = 4 cm.
- Solution: Applying the above formula, we have
So the area of the circle above is 50.24 cm2
Above is the guide on how to calculate the area of a circle and an example illustrating the calculation. Hopefully, with this article, you, as students, can apply it to real-world problems to calculate the areas of other circles.
A parallelogram is a special type of trapezoid. Students will encounter many exercises related to parallelograms, including exercises on calculating the area of parallelograms. Understanding the formula for calculating the area of a parallelogram will help students solve these exercises quickly.
If you have studied semicircles, remember that knowing the formulas for the perimeter and area of semicircles is essential to help you solve exercises easily and apply these formulas directly to problems.
- Explore more: Formulas for calculating the perimeter and area of a semicircle
