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plane surfaces click to hear : plane surfaces

Set of points on a plane that describes an area of space.
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See plane surfaces in : french | spanish
parts of a circle quadrant center arc radius sector diameter semicircle circumference

parts of a circle click to hear : parts of a circle

Circle: closed plane curve; all its points are the same distance from a fixed point (center).

quadrant click to hear : quadrant

Quarter of a circle’s circumference; it corresponds to an arc of 90°.

center click to hear : center

Point located at the same distance from every point on the circle’s circumference.

arc click to hear : arc

Section of a circle between two points on the circle.

radius click to hear : radius

Line that joins a point on a circle’s circumference to its center; it is one half of the diameter.

sector click to hear : sector

Surface bounded by two radii and an arc of a circle.

diameter click to hear : diameter

Line that connects two points on a circle’s circumference and passes through its center.

semicircle click to hear : semicircle

A half circle that is delimited by its diameter.

circumference click to hear : circumference

Length of a circle that corresponds to the product of its diameter and pi.