ACT 数学与评估 - Geometry

the measure of how steep a line is, found by dividing the change in height by the change in horizontal distance

斜率

(geometry) a part of a circle, which is curved

弧

a unit for measuring angles, defined by the angle made when the radius of a circle is laid along its edge

弧度

the length of a straight line drawn from the center of a circle to any point on its outer boundary

半径

a straight line from one side of a round object, particularly a circle, passing through the center and joining the other side

直径

the total length of the external boundary of something

周长

(geometry) the length of the external boundary of a curved shape, especially a circle

周长

the measurement of a piece of land or a flat surface

面积

the amount of space that a substance or object takes or the amount of space inside an object

体积

the space between two lines or surfaces that are joined, measured in degrees or radians

角度

an angle measuring exactly 90 degrees

直角

one of a pair of opposite angles made by two intersecting lines, which are always equal

垂直角

an angle formed between two sides of a polygon that lies inside the shape

内角

an angle that measures between 0 and 90 degrees, which is less than a right angle (90 degrees)

锐角

pairs of angles that share a common side and vertex in a polygon or between intersecting lines

相邻角

(of angle) greater than 90 degrees but less than 180 degrees

钝角

a measuring instrument used to measure and draw angles

量角器

(of lines or planes) intersecting each other at a 90 degree angle

垂直的

(geometry) a flat shape consisting of three or more straight sides

多边形

(geometry) any flat shape with four straight sides, the opposite sides of which are equal and parallel to each other

平行四边形

characterized by or resembling a tetrahedron, which has four triangular faces

四面体的

(geometry) a flat shape with four flat sides, two of which are parallel

梯形

a geometric shape with five angles and five straight sides

五边形

(geometry) a flat figure with four straight sides and four angles

四边形

(geometry) a flat shape with four equal sides in which opposite angles are equal

菱形

a small circle whose center moves around the circumference of a larger circle

小圆周

a geometric curve formed by the intersection of a plane with two cones, resulting in two symmetrical branches

双曲线

(geometry) a symmetrical open curve that is similar to the path of an object thrown into the air passes till it falls back to earth

抛物线

(geometry) a closed plane curve that has two focal points

椭圆

a flat geometric shape consisting of three straight sides and one right angle

直角三角形

a triangle in which all three interior angles are less than 90 degrees

锐角三角形

a type of triangle with all three sides of equal length

等边三角形

a type of triangle that has all three sides of different lengths

不等边三角形

describing a triangle with at least two sides of equal length

等腰

the longest side of a right-angled triangle, opposite the right angle, and defined as the side opposite the right angle in a right-angled triangle

斜边

a three-dimensional geometric shape with two parallel circular bases connected by a curved surface at a right angle to the bases

直圆柱

a three-dimensional geometric shape that has a rectangular base and four triangular faces that meet at a single point called the apex

矩形金字塔

(geometry) a lack of symmetry or equivalence in shape or size between the two sides or parts of something

不对称

a point where two or more lines, edges, or rays meet to form an angle, or the point at which the sides of a polygon intersect

顶点

(geometry) a straight line that joins the opposite corners of a flat shape at an angle

对角线

(in geometry) describing shapes of the same size and form

全等的

the side of a geometric shape, usually the one considered as the bottom, from which the height is measured

底边

(mathematics) any of the pair of geometric figures such as lines or planes which do not meet or intersect

平行线

a line that divides a shape into two congruent parts

对称轴

a series of numbers in which each term after the first is found by multiplying the previous term by a fixed, non-zero number

几何级数

the total area that the surface of a three-dimensional object occupies

表面积

(of a line) intersecting two or more other lines at different points

横断的

one-fourth of a circle, formed by two perpendicular radii and the connecting arc

象限

a straight line that a curve approaches indefinitely but never intersects, characterizing the limiting behavior of the curve

渐近线

to divide something into two equal parts

二分

a straight line that touches a curve or surface at exactly one point, known as the point of tangency

切线

a straight line segment that connects two points on the edge of a circle

弦

(geometry) to move a shape or figure from one position to another without rotating, resizing, or otherwise altering its shape

平移