Colors and Shapes - Two-Dimensional Shapes

Read this lesson to learn the names of some two-dimensional shapes in English, such as "kite", "square" and "oval".

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circle [noun]

a completely round, plain shape

Ex: The Earth is approximately a sphere , which is like a 3D circle .

triangle [noun]

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

Ex: The roof of the house formed a triangle at the top , providing stability .

rectangle [noun]

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

Ex: She drew a rectangle on the paper to outline the garden plot .

kite [noun]

a four-sided shape with two pairs of equal-length adjacent sides

square [noun]

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

Ex:

trapezoid [noun]

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

parallelogram [noun]

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

rhombus [noun]

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

polygon [noun]

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

Ex: The stop sign is an example of an octagonal polygon .

right triangle [noun]

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

oblique triangle [noun]

a triangle that does not have a right angle

Ex: The roof of the house formed an oblique triangle against the evening sky .

scalene triangle [noun]

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

Ex: The bridge 's supports created a scalene triangle pattern against the skyline .

isosceles triangle [noun]

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

Ex: The altitude drawn from the vertex angle of an isosceles triangle bisects the base into two equal segments .

equilateral triangle [noun]

a type of triangle with all three sides of equal length

Ex: The fence surrounding the garden formed an equilateral triangle at each corner .

acute-angled triangle [noun]

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

Ex: The shadow on the ground looked like an acute-angled triangle .

obtuse-angled triangle [noun]

a type of triangle that has one angle greater than 90 degrees

Ex: In geometry class , we learned about the properties of obtuse-angled triangles .

rhomboid [noun]

(geometry) a parallelogram with four straight sides and no right angles

semicircle [noun]

any half of a circle

Ex: He drew a semicircle on the board to explain the concept of angles .

lozenge [noun]

(geometry) a four-sided figure with opposite equal angles, forming a diamond shape

Ex: The heraldic shield displayed a golden lozenge .

oblong [noun]

a rectangular figure that has unequal adjacent sides with arched angles

Ex:

oval [noun]

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

Ex: In geometry , an oval is often described as an ellipse with varying lengths .

Colors and Shapes
Shades of Black	Shades of Blue	Shades of Azure	Shades of Cyan
Shades of Gray	Shades of Dark Brown	Shades of Light Brown	Shades of Dark Green
Shades of Light Green	Shades of Magenta	Shades of Orange	Shades of White
Shades of Yellow	Shades of Pink	Shades of Red	Shades of Purple
Words Related to Colors	Two-Dimensional Shapes	Three-Dimensional Shapes	Polygons
Lines, Angles, and Curves	Words Related to Shapes