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

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
RELATED QUESTIONS
Hannah drew a circle with a radius of 30 centimeters. Jonas drew a circle with a radius... (answered by LinnW)

Alexa drew a rectangle with an area of 36 square centimeters. The rectangle she drew... (answered by stanbon)

What is the measure of the central angle of a circle with radius 30 centimeters that... (answered by ikleyn)

What is the measure of the central angle of a circle with radius 30 centimeters that... (answered by josmiceli)

Sean drew a circle with an area of 254.34 square centimeters.What is the diameter of... (answered by rwm,Gogonati)

What is the circumference of a circle with a diameter of 30... (answered by piglet162431)

What is the circumference of a circle with a diameter of 30... (answered by ptaylor)

what is the area of a circle if its radius equals 30 centimeters (answered by Alan3354)

If a radius of a certain circle is tripled, with 8.2 centimeters then added, the result... (answered by Theo)