ACT の数学と評価 - Geometry

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

傾き

(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

ラジアン

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

周囲

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

円周

the measurement of a piece of land or a flat surface

面積

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

体積

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)

鋭角

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

連続角

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

鈍角

a measuring instrument used to measure and draw angles

分度器

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

垂直の

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

多角形

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

平行四辺形

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

四面体の

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

台形

a geometric shape with five angles and five straight sides

五角形

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

四角形

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

ひし形

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

エピサイクル

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

双曲線

(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

放物線

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

楕円

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

鋭角三角形

a type of triangle with all three sides of equal length

正三角形

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

不等辺三角形

describing a triangle with at least two sides of equal length

等脚

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

斜辺

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

直円柱

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

長方形のピラミッド

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

非対称

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

頂点

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

対角線

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

合同の

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

底辺

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

平行線

a line that divides a shape into two congruent parts

対称の線

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

等比数列

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

表面積

(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

区分

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

漸近線

to divide something into two equal parts

二等分する

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

接線

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

平行移動する