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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 ...
- 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 2D shape has no thickness or depth. Example 3: Match the 2D shape with its property. (i) It has no corners and edges. (ii) It has one pair of opposite sides parallel to each other while the other two sides are non-parallel. (iii) It is a closed figure with three straight sides. (iv) Each of its angles measures 90°.
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.
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.
Describe two-dimensional shapes. Triangles, rectangles, squares, trapezoids and so on, are some examples of two-dimensional shapes. The sides and vertices of these shapes are, Triangle: A triangle has 3 straight sides and 3 vertices. Rectangle: A rectangle has 4 straight sides and 4 vertices. Square: A square has 4 sides and 4 vertices.
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In second grade, students are taking classifying 2D shapes one step further, recognizing and drawing shapes with specific attributes, including triangles, quadrilaterals, pentagons, and hexagons. At this stage, they begin to realize that shapes can fit into multiple categories. For example, they are already familiar with shapes like squares and ...
