アカデミック IELTS (バンド 5 以下) - Geometry

a figure, either hollow or solid, with six equal square sides

立方体

a shape that is wide in the middle and narrow at both ends

オーバル, 楕円

a shape with four equal, sloping straight sides, forming a point at the top and another at the bottom

ひし形, ダイヤモンド

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

角度

a row of people or things behind each other or next to each other

列

(geometry) an element that only has position, with no size or dimension

点, 幾何学的点

a solid object with a square base and four triangular sides joined to a point on the top

ピラミッド

(geometry) any of the two-dimensional faces of a three-dimensional figure

表面, 面

a shape that consists of two curved lines at the top and a V shape at the bottom

ハート, ハート型

a completely round, plain shape

円

a shape with four equal straight sides and four right angles, each measuring 90°

正方形

anything with a curved top and parallel sides

アーチ, 曲線

(geometry) a shape that consists of a line alternating its direction to left and right

ジグザグ, ジグザグ（幾何学的に）

any half of a circle

半円

(geometry) a curved shape or design that gradually winds around a center or axis

スパイラル

a line or shape that is not straight and bends gradually

曲線, アーク

an object that has a flat, round, and circular shape

ディスク, 円盤

one half of the earth divided by the equator

半球

prominent rounded projection or segment, often seen in various waveforms or patterns

葉

(geometry) a flat shape with four right angles, especially one with opposing sides that are equal and parallel to each other

長方形, 長方形の

(geometry) a flat shape consisting of three straight sides and three angles

三角形

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

鋭角, acute angle

an angle that measures more than 90 degrees but less than 180 degrees

鈍角

an angle measuring exactly 90 degrees

直角, 90度の角度

an angle that measures exactly 180 degrees, which is the same as a straight line

直角, 平面角

(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins

軸