How to Calculate the Area of a Circle

MatholiaChannel

This instructional math video provides a step-by-step guide on calculating the area of a circle when the radius is known. It presents three distinct examples, each utilizing a different representation of Pi (π): first using the fraction 22/7, second using the decimal 3.14, and third expressing the final answer in terms of Pi itself. This variety helps students understand that Pi can be approximated or kept exact depending on the problem's requirements. The video covers key mathematical themes including geometry formulas, substitution of values into equations, multiplication with fractions and decimals, and the importance of including correct units (square centimeters and square meters). It visually demonstrates the simplification process, such as cancelling out common factors in fractions and moving decimal points when multiplying by 100. For educators, this video serves as an excellent modeling tool for 6th and 7th-grade geometry lessons. It breaks down the abstract formula A = πr² into concrete steps: Write the formula, Substitute the values, and Solve. The clear, uncluttered visuals allow teachers to pause at each step to check student understanding or ask for predictions before the calculation is completed on screen.