SOLUTION: Hannah drew a circle with a radius of 30 centimeters. Jonas drew a circle with a rsdius of 20 centimeters. What is the approximate difference in the sreasif their circles
Algebra ->
Customizable Word Problem Solvers
-> Geometry
-> SOLUTION: Hannah drew a circle with a radius of 30 centimeters. Jonas drew a circle with a rsdius of 20 centimeters. What is the approximate difference in the sreasif their circles
Log On
Question 829767: Hannah drew a circle with a radius of 30 centimeters. Jonas drew a circle with a rsdius of 20 centimeters. What is the approximate difference in the sreasif their circles Answer by JulietG(1812) (Show Source):
You can put this solution on YOUR website! Do you remember how to find the area of a circle?
Pi * r^2
.
Hannah's circle has a radius of 30cm. 30cm * 30cm = 900 cm^2.
Multiply that by pi (we'll use 3.14) to get 2826 cm^2
.
Jonas' circle has a radius of 20cm. Let's square that. 20cm * 20cm = 400cm^2.
Multiply that by pi to get 1256 cm^2.
.
Now it's simple subtraction. 2826 - 1256 = 1570cm^2
