Circle
Circle Calculator: Calculate properties of circles, such as circumference and area, with our easy-to-use calculator. Ideal for geometry tasks.
\begin{align} A &= \pi r^{2} = \frac {\pi d^{2}}{4}\\ \\ C &= 2\pi r = \pi d\\ \\ d &= 2r\\ \\ \pi &= 3.1415926535897...\\ \\ 2\pi &= 6.2831853071796...\\ \end{align}
Playful learning for kids. Get the App!
TeddyBase is a playful educational app for iPhone and iPad, developed by calkoo.com team — perfect for kids and families to explore, learn, and imagine together! Learn colours, letters, shapes and more!
