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How does the radius of a circle affect it's size?
Discover how the lenth of the radius affects the area and circumfance of a circles. Slide "r_1" to change the length of the radii of the circles. Slide "a"
to change the lenght of r_2 in relation to r_1.
- Fix a=1 and move r_1. What effect does this have on each circle? What happens to the areas of the circles? the circumfrence?
- Now fix r_1 and move a. What happens differently than in part 1?
- Based off your observations, what is "a"?
- Using your observations above and the standard equations for the area and circumfrence of a circle create
a general formula to find the area and circumfrence of c_2 from c_1.
- Area of a circle= &pi r2
- Circumference of a circle= 2&pi r
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