Joke Collection Website - Mood Talk - The diameter of a circular roller skating rink is 30 meters, and the radius is increased by 5 meters after expansion. How many square meters has been added after the expansion of the roller skating ri
The diameter of a circular roller skating rink is 30 meters, and the radius is increased by 5 meters after expansion. How many square meters has been added after the expansion of the roller skating ri
The diameter of a circular roller skating rink is 30 meters, and the radius is increased by 5 meters after expansion. How many square meters has been added after the expansion of the roller skating rink? List the test objects and explain why.
Area of circle (s)= pi (3. 14) * square of radius (r)
So the increased area is 3.14 * 20 * 20-3.14 *15 *15.
=1256m2-706.5m2 = 594.5m2.
That is, the increased area is 594.5 square meters.
Note: "20*20" and "15* 15" represent the square of the radius, because you can't divide the square by 2.
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