The outside limit of an object, a surface or an area; The part furthest from the centre.
- a. A member of a set.
- b. A point, line, or plane. A part of a geometric configuration, such as an angle in a triangle.
- c. The generatrix of a geometric figure.
- d. Any of the terms in the rectangular array of terms that constitute a matrix or determinant.
A closed, symmetric curve shaped like an oval, which can be formed by intersecting a cone with a plane that is not parallel or perpendicular to the cone’s base. The sum of the distances of any point on an ellipse from two fixed points (called the foci) remains constant no matter where the point is on the curve.
engineering notation 工程计数法
A version of scientific notation in which the exponent of ten must be divisible by three. As an alternative to writing powers of 10, SI prefixes can be used, which also usually provide steps of a factor of a thousand.On calculators, engineering notation is named “ENG”.
To increase the size, amount, or extent of something, or become larger.
equal 等于, 相等的
Being the same or identical to in size, quantity, value, or standard.
equal sign 等号
A statement that two quantities are equal; equation.