How to Find the Radius of a Circle from the Area

In this math video we will learn how to find the radius of a circle from the area of a circle. We will be provided with the area of a circle in terms of pi and asked the measurement of the radius. We will review and use the formula for the area of a circle as pi multiplied by r squared. We will understand that r represents the radius of a circle which is the distance from the center to the edge of the circle. We will input the given area into the formula. We will divide both sides by pi. We will understand that r squared is r multiplied by r. We will determine the square root by determining what number value when multiplied by itself is 1600. An exemplar solution is modeled and explained.