Solutions
KM #5: The Size of the Earth—Estimation in Arizona (Level 2)
Mathematical Content: Geometry (radius and circumference of a circle; volume of a sphere); interior angles.
SOLUTIONS: KM # 5
Using Arizona Locations to Estimate the Circumference of the Earth
Question 1: What is the circumference of the Earth?
First, 
Next, 3.3 o is 
of the entire circumference
Then divide the distance from S to K by .009 to get
as your estimate of the circumference of the Earth.
Question 2: What is the radius of the Earth?
A. Compute the radius of the Earth using your estimate of the circumference. (Round your answer to 1 decimal place)
B. Convert your answer to part A to meters (1 km = 1000 meters).
meters
Question 3: What is the volume of the Earth?. 