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Identify shapes as two-dimensional (lying in a plane, “flat”) or three-dimensional (“solid”). Grade 1: Geometry (1.G.A.2) Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular ...
Circles. A circle is a 2D shape with one curved side and no angles. Circles are used to represent planets, the sun, and the moon. Circles also exist in the shape of a coin, the pupil in your eye, the side of a lollipop, or a yo-yo. 4. Triangles. A triangle is a 2D shape that has three sides and three angles.
- Overview
- Definition
- Types
- Circle Shape
- Triangle
- Square
- Rectangle
- Pentagon
This article is about the explanation of different types of 2D Shapes like Circle, Triangle, Square etc., along with their properties and comparison between 2D & 3D Shapes.
In maths, 2d shapes are defined as plane figures that can be drawn on a flat surface or piece of paper. They have various parameters such as area and perimeter. Some contain sides and corners while others have curved boundaries.
The basic types of 2d shapes include circle, triangle, square, rectangle, pentagon, octagon etc. Polygons with equal sides and angles are called regular polyggons while the circle is a non-polygon shape with a curved boundary.
A circle is a closed figure in which all points in the plane are equidistant from the center point; it has radius length from center to outer line; examples include wheels and pizzas.
A triangle is three-sided polygon (2D shape) with three edges & vertices; sum of its angles = 180°; example - pyramids .
A square is four-sided polygon (2D shape) whose sides & angles are equal in length & 90° respectively ; diagonals bisect each other at 90° ; examples - wall or table .
A rectangle has 4 sides where opposite sides are equal & parallel to each other with all angles being 90° ; examples - brick , TV , cardboard .
A pentagon is five sided polygon (2D shape) that can be regular/irregular ; interior angle = 108° for regular pentagons ; exterior angle = 72° for regular pentagons ; 5 diagonals exist .
A polygon is a 2D shape with straight sides. To be a regular polygon all the sides and angles must be the same: Triangle - 3 Sides. Square - 4 Sides. Pentagon - 5 Sides. Hexagon - 6 sides. Heptagon - 7 Sides. Octagon - 8 Sides. Nonagon - 9 Sides.
There are two types of two-dimensional shapes: open and closed two-dimensional shapes. Closed shapes. Closed shapes are those shapes that are enclosed from all sides and have no openings. A closed shape does not have any openings in its boundary. All sides of the shape connect to other sides to form vertices. They start and end at the same point.
2D Shapes. A 2D shape is a flat shape that has only two dimensions - length and width, with no thickness or depth, that is the reason why it is called a two-dimensional shape. For example, a sheet of paper is two-dimensional in shape. It consists of a length and a width but does not have any depth or height. Some common 2D shapes are squares ...
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Aug 16, 2024 · Properties of 2D Shapes. 1. Circle. A circle is a perfectly round shape characterized by all points on the perimeter being equidistant from a single point in the center. Circles are unique among 2D shapes in having no straight edges or vertices. They are known for their infinite lines of symmetry.
