maths.free › Geometry › Circles

Circles

Circumference, area and the meaning of π.

π is the ratio of any circle's circumference to its diameter, the same number for a coin and for a planet. From the radius alone you get the diameter (2r), the circumference (2πr) and the area (πr²).

工作范例 · circle radius 2

Geometry · Circles

Circle radius 2

2

一步

  1. r = 2

    Everything about a circle follows from its radius.

  2. d = 2r = 4

    Diameter.

  3. C = 2\pi r = 4 \pi \approx 12.566

    Circumference.

  4. A = \pi r^2 = 4 \pi \approx 12.566

    Area.

发送答案
C = 4 \pi,\quad A = 4 \pi

现在轮到你 选择问题, 输入或绘制您自己的 。 每一步, 图片, 答案隐藏到您询问 。

保持你自己的工作

免费账户在每一课上都添加注解, 记录你完成的, 在一个地方解决的, 以及您可以询问的关于此页的导师。 数学本身向每个人开放, 是否签名 。

签名上签名 登录

此处所用符号

输入完整定义、图片和其中每个字母的含义的符号。

如何: Circles

  1. Everything about a circle follows from its radius.
  2. Diameter.
  3. Circumference.
  4. Area.

人们对人们提出的问题

Why does every triangle have angles adding to 180°?

Draw a line through one vertex parallel to the opposite side: the two alternate angles equal the other two angles of the triangle, and the three angles at the vertex lie on a straight line. That is Euclid's proof, and it is why the fact holds only on a flat plane.

When do I use the law of sines versus the law of cosines?

Cosines when you know three sides, or two sides and the angle between them. Sines when you know an angle and the side opposite it, plus one more piece.

What is the difference between area and perimeter?

Perimeter is the length of the boundary (one dimension, measured in metres); area is the amount of surface inside (two dimensions, square metres). Doubling every side doubles the perimeter but quadruples the area.

更多 Geometry

TrianglesPythagorean theoremPolygonsSolidsCoordinate geometryEuclid's axioms and the structure of proofCongruent and similar trianglesCircle theoremsTransformations: translation, rotation, reflection, dilationSolid geometry: prisms, pyramids, spheres