Shapes · Nouns — English Vocabulary

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

"The door is a rectangle."

"A rectangle has four sides and four right angles with opposite sides equal in length."

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

"A cylinder has two bases."

"The engineer designed a hollow cylinder with a specific radius and height for the structural component."

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

"The box is a cuboid."

"A standard brick is a perfect example of a cuboid, a rectangular prism with six flat faces."

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

"A parallelogram is a four-sided shape with opposite sides that are parallel."

"A rectangle is a special type of parallelogram where all four angles are right angles."

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

"The trapezoid has one pair of parallel sides."

"A trapezoid is a quadrilateral with at least one set of parallel sides"

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

"Right triangle has."

"A right triangle has one angle that measures exactly ninety degrees."

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

"Spheroid is slightly flat."

"Scientists describe Earth as a spheroid because it is slightly flattened at both poles."

any half of a circle

"The table was a semicircle."

"The architect designed a beautiful garden path in the shape of a semicircle around the fountain."

a geometric shape with five angles and five straight sides

"A pentagon has five."

"The United States Department of Defense headquarters is famously known as the Pentagon due to its five-sided geometric shape."

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

"A hexagon has six sides."

"A hexagon is a polygon with six sides and six angles, commonly found in nature."

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

"A heptagon has seven sides."

"The architectural design featured a unique heptagon shape for the central courtyard, creating an unusual space."

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

"An octagon has eight sides."

"The stop sign is a familiar example of an octagon, a polygon with precisely eight equal sides and angles."

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

"A nonagon has nine."

"A nonagon is a geometric figure that possesses nine straight sides and nine corresponding angles."

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

"A decagon has ten."

"A decagon is a polygon characterized by having exactly ten straight sides and ten interior angles."

a five-pointed star

"The ancient symbol was a pentagram inside a circle."

"The pentagram is a five pointed star often used as a symbol in various religious and occult traditions."

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

"A hexagram is a six-pointed star formed from two overlapping triangles."

"The geometric hexagram is a six-pointed star formed by two overlapping equilateral triangles."

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

"The path made a zigzag."

"The path through the mountains followed a steep zigzag, making the ascent challenging but rewarding."

(geometry) a flat figure consisting of eleven straight sides and eleven angles

"A regular hendecagon has eleven equal sides."

"The hendecagon is a rarely seen polygon that has eleven sides and eleven interior angles."

(geometry) a flat figure that consists of twelve sides and twelve angles

"The twelve-sided figure is a dodecagon."

"The architect incorporated the precise angles of a dodecagon into the unique design of the building."

a polygon with thirteen sides and thirteen angles

"The tridecagon is a polygon with thirteen sides."

"The tridecagon is a thirteen sided polygon that appears in some geometric puzzles and architectural details."

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

"An ellipse is oval."

"The orbit of a planet around the sun is not a perfect circle but rather an ellipse with the sun at one focus."

a completely round, plain shape

"Draw a big circle."

"The children sat in a circle and listened to their teacher read a story aloud."

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

"The tile is a square."

"The artist drew a perfect square on the canvas with a ruler."

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

"The sail was a triangle."

"The teacher asked the students to draw a triangle with three equal sides on the whiteboard."

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

"An oval is roundish."

"The artist painted an oval portrait of the queen with delicate features."

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

"The gem was a diamond."

"The baseball field is laid out in the shape of a diamond with four bases."

a shape with five or more points, representing a star in the sky

"I see a star."

"The child drew a large, colourful star on the page with her favourite crayon."

(in geometry) a three-dimensional surface where all points are equidistant from a center

"A sphere is round shape."

"The planet Earth is approximately a perfect sphere, with all points on its surface equidistant from its core."

a three-dimensional figure made of six square or rectangular faces

"A cube has sides."

"The architect designed a building in the shape of a perfect cube with equal sides."

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

"A cone has one point."

"The traffic cone, a familiar object, is a perfect example of a geometric cone with a circular base."

a solid with a polygonal base and triangular faces that meet at a single point

"The pyramid is very old."

"The ancient pyramid in Egypt has a square base and four triangular faces that meet at a single point at the top."

either half of a sphere

"Earth has two hemispheres."

"The Northern Hemisphere experiences winter when the Southern Hemisphere is enjoying its summer season."

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

"Prism has flat sides."

"A triangular prism will disperse a beam of white light into its constituent spectral colors"

a curved shape with narrow points at the ends that appears wider in the middle, like the shape of the moon in its first and last quarters

"The crescent was curved."

"A crescent is a curved shape resembling a thin segment of a ring"

a mark or an object formed by two short lines or pieces crossing each other

"Draw a cross."

"The ancient map had a prominent red cross marking the spot where the treasure was buried."

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

"The shell had a spiral."

"The spiral staircase gradually winds around a central axis as it climbs up to the top of the tower."

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

"A kite has four sides."

"The geometric shape of a kite is characterized by its two distinct pairs of equal adjacent sides."

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

"A lozenge is shaped like a diamond."

"The old-fashioned sweets were shaped like a lozenge and had a pleasant minty flavor."

a rectangular figure that has unequal adjacent sides with arched angles

"The dining table was an oblong shape"

"She placed an oblong mirror above the fireplace to make the narrow hallway look much wider."

a solid shape resembling a donut or ring, made by spinning a circle around a line that does not cut through the circle

"The torus is donut-shaped."

"A torus is a three-dimensional surface of revolution generated by revolving a circle around an axis that is coplanar with but does not intersect the circle itself."

a line or shape that is not straight and bends gradually

"The line made a curve."

"The race car driver skillfully navigated the sharp curve at high speed, maintaining control of the vehicle."

a pair of geometric figures, such as lines or planes, that do not meet or intersect, no matter how far they are extended

"Parallel lines never meet."

"Parallel lines are lines in a plane that never meet no matter how far they are extended."