2D Shapes Vocabulary in English
1. square – 4 sides of equal length, 4 right angle corners
2. circle – 1 curved side, same distance across at any side (diameter)
3. equilateral triangle – 3 sides, 3 equal angles, 3 sides of equal length
4. right-angled triangle – 3 sides, 2 sides of equal length, 1 right angle
5. scalene triangle – 3 sides of different length, 3 different angles
6. oval – 1 curved side, different distance across at any side (diameter)
7. pentagon – 5 sides, the sum of the internal angles is 540o
8. isosceles triangle – 3 sides, 2 sides of equal length, 2 equal angles
9. hexagon – 6 sides, the sum of the internal angles is 720o
10. rectangle – opposite sides are equal length, 4 right angle corners
11. kite – no parallel sides, 2 pairs of adjacent equal length sides, 2 equal angles
12. rhombus – 2 pairs of parallel sides, 4 sides of equal length, also called a diamond
13. octagon – 8 sides, the sum of the internal angles is 1080o
14. quadrilateral – 4 sides, the sum of the internal angles is 360o
15. parallelogram – 2 pairs of parallel sides, opposite sides are equal length
16. trapezium – 4 sides, 2 parallel sides, the sum of the internal angles is 360o
2D Shapes Vocabulary | Image
Polygons are geometrical shapes with straight sides that form closed figures. Some advanced polygons include:
- Scalene Triangle: A triangle in which all three sides and angles are different.
- Rhombus: A quadrilateral with all sides equal in length and opposite angles equal.
- Pentagon: A five-sided polygon with equal angles and sides.
- Hexagon: A six-sided polygon with equal angles and sides.
- Heptagon: A seven-sided polygon with equal angles and sides.
- Octagon: An eight-sided polygon with equal angles and sides.
- Nonagon: A nine-sided polygon with equal angles and sides.
- Decagon: A ten-sided polygon with equal angles and sides.
Geometric solids are three-dimensional shapes with flat faces, straight edges, and vertices. Some common geometric solids include:
- Cone: A solid with a circular base and a curved surface that joins the base’s points to a single vertex.
- Cylinder: A solid with two parallel, congruent circular bases connected by a curved surface.
- Cube: A solid with six equal square faces, where all edges are equal in length.
- Sphere: A solid with no edges or vertices, and all points on its surface are equidistant from its center.
Some other advanced shapes cover more irregular forms and combinations. A few examples are:
- Diamond: A type of quadrilateral with all sides equal in length, opposite sides parallel, and opposite angles equal. Similar to a rhombus.
- Heart: A shape with a curved top and a sharp point at the bottom. It is often used to represent love and affection.
- Cross: A shape with two intersecting lines or bars, usually perpendicular to each other. It is a symbol of various faiths and beliefs.
- Star: A shape with multiple points, often representing celestial bodies, like stars in the sky.
- Parallelogram: A quadrilateral with opposite sides parallel and equal in length.
- Kite: A quadrilateral with two pairs of adjacent sides equal in length and no opposite sides parallel.
- Trapezoid: A quadrilateral with one pair of parallel sides.
- Ellipse: A curve on a plane that surrounds two focal points, where the sum of the distances to the two focal points is constant for every point on the curve.
- Crescent: A shape that resembles a segment of a circle or an ellipse, with a tapering outline.
- Curve: An indefinitely continuous, smooth line without abrupt breaks or changes in direction.