The radius of the first circle is 7 dm, and the radius of the second circle is 3 times larger.
| February 6, 2021 | education
The radius of the first circle is 7 dm, and the radius of the second circle is 3 times larger. How many decimeters is the diameter of the first circle less than the diameter of the second circle?
To solve this problem, remember that the diameter of a circle is equal to the sum of two radii, that is, d = r + r = 2r. Let’s calculate the length of the radius of the second circle.
r2 = 7 * 3 = 21 dm.
Let’s calculate the diameter of the first circle.
d1 = 7 + 7 = 14 dm.
Let’s calculate the diameter of the second circle.
d2 = 21 + 21 = 42 dm.
d2-d1 = 42-14 = 28 dm
Answer: 28 dm.
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