Grade level: 5 – 6th grades
Skills: Radius, diameter, circumference & area of a circle
Related environmental issues: Energy
The size of wind turbine has been getting larger to generate electricity from wind more efficiently. About 75% of the wind turbines built in 2014 in the United States had a rotor diameter of 100 meters. “100 meters” is about the same as the length of a Football Pitch.
What is the radius?
What is the circumference?
- What is the area?
Source: American Wind Energy Association, Market Report
1. 50 meters (100/2 = 50)
2.100π m(2 x π x 50 = 100π)
3. 2,500π m2 (π x 50 x 50 = 2,500π)