Vocabulary for IELTS Academic (Band 6-7) - Geometry

Here, you will learn some English words related to Geometry that are necessary for the Academic IELTS exam.

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cylinder

[noun]

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

Ex: The ancient columns were made in the shape of massive stone cylinders, supporting the grand structure .

sphere

[noun]

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

Ex: Spheres are often used in design for their smooth and harmonious appearance .

hexagon

[noun]

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

Ex: In geometry class , students learned how to calculate the area of a hexagon.

cone

[noun]

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

Ex: The chef stacked three ice cream scoops in a waffle cone for the perfect summer treat .

tangent

[noun]

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

Ex: When the sun is setting , you can use the tangent to figure out the angle the sun makes with the horizon .

ray

[noun]

a straight line that starts at a point and extends infinitely in one direction

Ex: The ray extends infinitely in one direction along the line .

isosceles triangle

[noun]

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

Ex: The sum of the interior angles of an isosceles triangle is always 180 degrees .

octagon

[noun]

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

Ex: The child 's drawing featured a perfectly symmetrical octagon.

swirl

[noun]

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

Ex: When mixing colors on a palette , an artist may create a swirl pattern to achieve a marbled effect .

vertex

[noun]

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

Ex: In a cube , each of the eight corners is a vertex formed by the meeting of three edges .

ellipse

[noun]

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

polygon

[noun]

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

Ex: Polygons can be classified based on the number of their sides , such as pentagons and hexagons .

pentagon

[noun]

a geometric shape with five angles and five straight sides

Ex: She drew a pentagon on the chalkboard to illustrate its shape to the students .

helix

[noun]

(geometry) a line curved on a conical or cylindrical surface, like a spiral staircase in shape

decagon

[noun]

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

Ex: The children were challenged to draw a perfect decagon during their geometry class .

nonagon

[noun]

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

heptagon

[noun]

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

Ex: One version of the game featured a board laid out in a grid of non-uniform heptagons instead of the usual squares .

ellipsoid

[noun]

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

Ex: Navigation systems often use ellipsoids to model the Earth 's surface for accurate positioning .

cuboid

[noun]

a three-dimensional geometric shape with six rectangular faces, resembling a box or a rectangular prism

spheroid

[noun]

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

Ex: Molten glass is spun at high speeds to form finely detailed scientific spheroids with uses as laboratory vessels or decorative art pieces .

prism

[noun]

(geometry) a solid figure with flat sides and two parallel ends of the same size and shape

polyhedron

[noun]

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

Ex: The architect used a polyhedron as the inspiration for the design of the modern sculpture in the park .

trigon

[noun]

a three-sided polygon

hexagram

[noun]

(geometry) a flat star-shaped figure with six points that can be formed by making equilateral triangles on each side of a regular hexagon

oblique angle

[noun]

an angle that measures either less or more that 90 degrees

Ex: A 150-degree angle is another example of an oblique angle, falling in the second quadrant .

reflex angle

[noun]

an angle that measures greater than 180 degrees but less than 360 degrees

diameter

[noun]

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

Ex: The technician used a caliper to determine the diameter of the bearings needed for the machinery repair .

circumference

[noun]

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

Ex: The mathematician used the circumference to solve the geometry problem .

radius

[noun]

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

Ex: The radius of a planet determines its gravitational influence and orbital characteristics within a solar system .

Vocabulary for IELTS Academic (Band 6-7)

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