Cách tính diện tích hình tròn và chu vi hình tròn

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Các kiến thức, công thức tính toán liên quan đến hình học đều rất quan trọng với các em học sinh bởi các dạng bài tập liên quan đến hình tròn khá phổ biến trong chương trình học, các em cần nắm vững những kiến thức này. Công thức tính diện tích và chu vi hình tròn hay công thức tính diện tích tam giác, diện tích hình thang là các kiến thức nền tảng và vô cùng quan trọng giúp các em học sinh, sinh viên hoặc những ngưởi có công việc liên quan đến tính toán và đo đạc như kỹ sư, thiết kế.

Công thức tính diện tích hình tròn, chu vi hình tròn khá đơn giản và dễ nhớ, tuy nhiên nếu lâu ngày không sử dụng có thể quên hoặc nhầm lẫn vì chúng khá giống nhau. Dưới đây là công thức cụ thể tính chu vi và diện tích hình tròn và các bài tập liên quan, các bạn cùng tham khảo để học tốt môn Toán hơn nhé.

Diện tích, chu vi hình tròn

1. Hình tròn là gì?

Trong hình học phẳng, một hình tròn là một vùng trên mặt phẳng nằm “bên trong” đường tròn. Tâm, bán kính và chu vi của hình tròn chính là tâm và bán kính của đường tròn bao quanh nó.

Một hình tròn được gọi là đóng hay mở tùy theo việc nó chứa hay không chứa đường tròn biên.

2. Công thức tính diện tích hình tròn

Diện tích hình tròn được tính bằng độ lớn của hình tròn chiếm trên một bề mặt nhất định.

Diện tích hình tròn

Diện tích hình tròn được tính theo công thức: Bình phương bán kính hình tròn nhân với Pi

Hoặc diện tích hình tròn cũng được tính theo công thức là bình phương đường kính nhân với Pi rồi chia cho 4.

Trong đó:

  • S: Là diện tích hình tròn.
  • r: Là bán kính hình tròn.
  • d: Là đường kính hình tròn.
  • \pi: là hằng số giá trị tương đương 3.14.

3. Công thức tính chu vi hình tròn

Chu vi hình tròn hay đường tròn là đường biên giới hạn của hình tròn. Chu vi hình tròn hay đường tròn là đường biên giới hạn của hình tròn.* Công thức tính chu vi hình tròn:

Đường kính nhân với PI

Hoặc 2 lần bán kính nhân PI

Trong đó:

  • C: Là chu vi hình tròn.
  • R: Là bán kính hình tròn.
  • D: Là đường kính hình tròn
  • \pi: Là hằng số giá trị tương đương 3.14.

4. Phương pháp nhớ công thức tính diện tích, chu vi Hình tròn

– Khi học công thức xong cũng như cách tính, bạn nên vận dụng vào làm bài tập để có thể ghi nhớ công thức cũng như hiểu được rõ bản chất vấn đề.
– Bên cạnh đó, bạn có thể học công thức thông qua thơ:

Hình tròn diện tích đơn giản
Bình phương bán kính ta nhân ngay vào
Ba phảy mười bốn phía sau
Chu vi cũng dễ tính mau bạn à
Đường kính ta lấy nhân ra
Ba phảy mười bốn, thế là đã xong.

Như vậy là chúng mình đã cùng bạn tìm hiểu định nghĩa hình tròn là gì, cách tính diện tích hình tròn và chu vi hình tròn. Hy vọng những kiến thức này sẽ giúp ích rất nhiều cho bạn đọc trong việc giải quyết các bài toán từ dễ đến khó.

Chúc các bạn học giỏi!

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