How to Find the Radius of a Circle from the Area

The video tutorial explains how to find the radius of a circle when given the area. It presents a problem involving a sprinkler watering a circular area of 1600 Pi square meters and guides viewers through solving for the radius. The solution involves using the formula for the area of a circle, dividing by Pi, and calculating the square root to find the radius. The tutorial encourages viewers to pause and attempt the problem before revealing the solution, promoting active learning.

What is the area of the circular region being watered by the sprinkler?

• 1600 square meters

• 1600 Pi cubic meters

• 1600 Pi square meters

• 1600 cubic meters

Which formula is used to find the area of a circle?

• Area = Pi * r^2

• Area = r^2 / Pi

• Area = Pi * r

• Area = 2 * Pi * r

What is the first step in solving for the radius when given the area in terms of Pi?

• Add Pi to both sides

• Divide both sides by Pi

• Multiply both sides by Pi

• Subtract Pi from both sides

What is the value of R-squared when the area is 1600 Pi?

• 1600

• 40

• 400

• 160

What is the radius of the circle if the area is 1600 Pi square meters?

• 40 meters

• 20 meters

• 30 meters

• 50 meters