Geometry
- A right angle contains 90°.
- A straight angle contains 180°.
- A full circle contains 360°.
- Two right angles make a straight line.
- Four right angles make a full circle.
The three dimensions are called:
- length, width, and depth, or
- length, width, and height.
- A point occupies no space, and is zero–dimensional (0D).
- A line has length (1D) and no width.
- A plane is a flat surface that in theory extends infinitely in two directions. A plane has no thickness.
- Area is the amount of space inside a two–dimensional figure (2D), measured in square units.
- Space is the infinite extension of the three dimensions of length, width, and depth.
- Volume is the amount of space inside a three–dimensional figure (3D), measured in cubic units.
- Time is often considered the fourth dimension.
- Parallel lines are always the same distance apart. Parallel lines do not intersect, except in the case of coincident lines.
- Perpendicular lines meet to form four right angles.
- Distance is the amount of space between two points, measured in linear units, along a given path. Distance is one–dimensional. (1D).
- Distance is always a positive quantity.
- The absolute value of a number is its distance from zero (0).
- Because the absolute value is a distance, it is always a positive number or zero, and is never negative.
- The sum of the angles of a triangle is 180°.
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