Area of Circle

Basic Concept

Area of a Circle


Rendered by

\(A = \pi\times r^2\)

\(\pi = \frac{22}{7} = 3.14\)

\(r = \text{radius}\)

Rendered by

\(A =\frac{1}{4} \pi\times d^2\)

\(\pi = \frac{22}{7} = 3.14\)

\(d = \text{diameter}\)

Area of a Sector



Rendered by


If \(\theta\) is measured in degrees then:

\(\text{Area of sector} = \frac{\theta}{360^\circ}\times \text{area of circle}\)

\(\text{Area of sector} = \frac{\theta}{360^\circ}\times \pi\times r^2\)


If \(\theta\) is measured in radians then:

\(\text{Area of sector} = \frac{1}{2}\times r^2 \times \theta\)

\(1 \pi \text { radians} = 180^\circ\)

\(1 \text{ radians ≈  57.3°}\)

(Next Lesson) Question 01
Kembali ke Area of Circle