Circumference and Area of a Circle
To calculate the circumference (which is like perimeter) and the area of a circle, you need a special irrational number: pi. Pi is the ratio of the circumference of a circle to its diameter. Watch this lecture series to explore the circumference and area of circles, and complete the interactive exercises.
Practice
Area of parts of circles - Questions
1.
Find the area of the shape.
Either enter an exact answer in terms of \(\pi\) or use \(3.14\) for \(\pi\) and enter your answer as a decimal.
________ units \(^{2}\)
2.
Find the area of the semicircle.
Either enter an exact answer in terms of \(\pi\) or use \(3.14\) for \(\pi\) and enter your answer as a decimal.
________ units \(^{2}\)
3.
Find the area of the semicircle.
Either enter an exact answer in terms of \(\pi\) or use \(3.14\) for \(\pi\) and enter your answer as a decimal.
________ units \(^{2}\)
4.
Find the area of the shape.
Either enter an exact answer in terms of \(\pi\) or use \(3.14\) for \(\pi\) and enter your answer as a decimal.
________ units \(^{2}\)