# Area of a circle

**To improve this 'Area of a circle Calculator', please fill in questionnaire.**

**The hyperlink to [Area of a circle]**

**The hyperlink to 'keisan Home'**

- Welcome,Guest
- User registration
- Login

- Home
- / Mathematics
- / Area

**The hyperlink to [Area of a circle]**

Area of an equilateral triangle

Area of a triangle given base and height

Area of a triangle given sides and angle

Area of a triangle (Heron's formula)

Area of a triangle given base and angles

Area of a parallelogram given base and height

Area of a parallelogram given sides and angle