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# Shapes and signs used in mathematics-By ShreyDBest

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### Shapes and signs used in mathematics-By ShreyDBest

1. 1. Different Types of Shapes & Signs Used in Mathemetics A project by:- Shrey Verma
2. 2. Shape  A shape is the form of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture, material composition.
3. 3. Types Of Shapes: 1 D Shape  A 1-D shape is a shape that, when selected, has a beginning point and an ending point . 1-D shapes typically look like lines. Examples are shown here.
4. 4. 2D Shape  A shape that only has two dimensions (such as width and height) and no thickness.
5. 5. Types of 2D Shapes Used in Mathematics  1) Triangle • A triangle is polygon with three side • Interior angles add up to 180°
6. 6. Types of 2D Shapes Used in Mathematics  2) Quadrilaterals • A quadrilateral is a polygon with 4 sides. • Interior angles add up to 360°
7. 7. Types of 2D Shapes Used in Mathematics Name Image Number of sides Sum of Int Angles Pentagon 5 540 Hexagon 6 720 Heptagon 7 900 Octagon 8 1080 Nonagon 9 1260 Decagon 10 1440
8. 8. 3D Shapes  3 Dimensional Shapes have 3 dimensions namely length, breadth and height
9. 9. Types of Shapes : 3D Shape Cube  Cubes have 6 faces, 12 edges and 8 vertices.  All sides on a cube are equal length.  All faces are square in shape.  A cube is a type of cuboid.
10. 10. Types of Shapes : 3D Shape Cyinder  Closed Cylinders have 3 faces, 2 edges and 0 vertices.  Closed cylinders have 2 circular or elliptical faces and one curved rectangular face.
11. 11. Signs
12. 12. Signs used in mathematics 1) ± (plus or minus) This means 6 ± 3 is both 6 + 3 and 6 − 3. 2) ÷ or ⁄ (devide) 6 ÷ 3 or 6 ⁄ 3 means the division of 6 by 3. 3) √ (square root) √x means nonnegative number whose square is x.
13. 13. Signs used in mathematics 4) ∞(Infinity) ∞ is an element of the extended number line that is greater than all real numbers; it often occurs in limits. 5) ≠ (Inequality) x ≠ y means that ‘x’ and ’y’ do not represent the same thing or value. 6) < (greater than) and > (smaller than) x<y means x is less than y. x<y means x is greater than y.