Joke Collection Website - Mood Talk - Can you explain it with the knowledge of circle? Try to talk about it
Can you explain it with the knowledge of circle? Try to talk about it
When a line segment rotates once around one of its endpoints in a plane, the trajectory of its other endpoint is called a circle.
the center of the mill is the previous endpoint, that is, the center of the circle; The center distance between the donkey and the mill is fixed, which represents the line segment; The donkey is the other endpoint; The route of donkey grinding is equivalent to the trajectory of another endpoint rotating once in the plane, which is a circle.
in a plane figure with the same area, the circumference of a circle is the smallest. Making the manhole cover round can ensure that the use of materials is the most economical under the same water flow rate, or the water flow rate is the largest when the use of materials is the same.
a circle
is a geometric figure. By definition, compasses are usually used to draw circles. The diameter and radius of the inner circle of the same circle are always the same, and the circle has countless radii and diameters. A circle is a figure with axial symmetry and central symmetry. The axis of symmetry is the straight line where the diameter lies. At the same time, the circle is a "positive infinite polygon", and "infinity" is just a concept. A circle can be regarded as a regular polygon composed of countless infinitesimal points. The more sides a polygon has, the closer its shape, perimeter and area are to a circle.
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