Find the area of a circle given the diameter - Online tutor - free Math videos

The video tutorial explains how to find the area of a circle. It introduces key terms like diameter and radius, and explains the concept of π as a ratio of the circle's diameter. The tutorial demonstrates how to calculate the area using the formula A = πR², emphasizing the importance of leaving answers in terms of π for precision. The example provided uses a diameter of 8, resulting in a radius of 4, and calculates the area as 16π.

What is the relationship between the diameter and the circumference of a circle?

Explain why the area of a circle is expressed in terms of π rather than as a decimal.