What are the important formulas for a circle

The video tutorial covers the topic of circles, starting with an introduction and basic definition. It explains that a circle is a set of points equidistant from a center point, with the radius being the distance from the center to any point on the circle. The diameter is the distance across the circle, and the circumference is the distance around it. Basic formulas for calculating the area and circumference are discussed, including the use of π (pi) and its approximation as 3.14. The tutorial emphasizes using the full value of π for calculations.

How is the circumference of a circle calculated?

What is the significance of the number π in circle geometry?