A quantity or number expressed by an algebraic term.
- A quantity capable of assuming any of a set of values.
- A symbol, especially ‘x’, ‘y’, or ‘z’, that is used usually in connection with quantifiers to represent individuals in a universe of discourse.
- Computing a named unit of storage that can be changed to any of a set of specified values during execution of a program. (Computer Science)
The point where two lines meet to form an angle, especially the point of a triangle or cone opposite the base.
Being or situated at right angles to the horizon; upright. Going straight up or down from a level surface or from top to bottom in a picture, etc.
vertical angles / vertically opposite angles 直角
Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
The amount of space that an object or a substance fills; the amount of space that a container has.
vulgar fraction 普通分数
A fraction (= a number less than one) that is shown as numbers above and below a line. Another name for simple fraction or common fraction.