Academic IELTS Words for "Geometry"

cylinder

noun

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(geometry) a solid or hollow shape with two circular bases at each end and straight parallel sides

Example

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The glass on the table was in the shape of a tall, slender cylinder.

The industrial containers were large cylinders, perfect for storing liquids.

sphere

noun

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(geometry) a round object that every point on its surface has the same distance from its center

hexagon

noun

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ə

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n

(geometry) a closed shape with six straight sides and six angles

cone

noun

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oʊ

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(geometry) a three dimensional shape with a circular base that rises to a single point

tangent

noun

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n

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(mathematics) the ratio of the opposite to the adjacent side of a triangle that has one angle of 90°

isosceles triangle

noun

/aɪsˈɑːsəlˌiːz tɹˈaɪæŋɡəl/

a type of triangle that has two sides of equal length and two angles of equal measure

Grammatical Information:

compound noun

octagon

noun

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(geometry) a polygon consisting of eight straight sides and eight angles

swirl

noun

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in geometry, a pattern or shape that exhibits a twisting or spiraling motion, often characterized by continuous, curved lines forming a rotational or helical design

vertex

noun

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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

polygon

noun

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

pentagon

noun

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a geometric shape with five angles and five straight sides

decagon

noun

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n

(geometry) a flat polygon with ten straight sides and ten angles

heptagon

noun

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a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles

ellipsoid

noun

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a three-dimensional shape similar to a stretched or compressed sphere

spheroid

noun

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(geometry) a round 3D shape like a ball that is slightly flattened at the top and bottom points

polyhedron

noun

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a solid shape made of flat sides that fit together along their edges

oblique angle

noun

/əblˈiːk ˈæŋɡəl/

an angle that measures either less or more that 90 degrees

right angle

Grammatical Information:

compound noun

diameter

noun

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aɪæ

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

circumference

noun

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

radius

noun

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

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