Find the area of a circle if its diameter is 18 dm. The diameter of the second circle is 3 times
| May 29, 2021 | education
Find the area of a circle if its diameter is 18 dm. The diameter of the second circle is 3 times less than the diameter of the first circle. Find the area of the second circle. How much is the area of the first circle larger than the area of the second circle?
1. Determine the radius of one circle.
18/2 = 9 centimeters.
2. Let’s calculate its area.
3.14 * 9² = 254.34 cm².
3. Find out what the radius of the other circle is.
18/3/2 = 3 centimeters.
4. The area of this circle is:
3.14 * 3² = 28.26 cm².
5. Find the difference between the areas of one and the other circles.
254.34 – 28.26 = 226.08 cm².
Answer: The area of the first is 226.08 square centimeters larger than the second.
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