Joke Collection Website - Talk about mood - The radius of a circle is three times and the circumference is three times. For example, you can write a narrative that I can understand.
The radius of a circle is three times and the circumference is three times. For example, you can write a narrative that I can understand.
Think like this:
1, the original radius is 2, and the extended radius is 2×3=6.
2. It is found that the circumference after enlargement is several times that of the original:
(2×3. 14×6)÷(2×3. 14×2)=3
3, the area has expanded several times:
(3. 14×6×6)÷(3. 14×2×2)=9
In this way, we can know that no matter how many times the radius or diameter is enlarged, the circumference is enlarged by the same multiple (because the circumference is also the length), and the area is the square of the enlarged length. Remember this knowledge point and fill in the blanks directly in the future.
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