Only notes

  Surface Area of Cuboid In everyday life,  we have seen many  objects like a wooden box, a matchbox, a tea packet, a chalk box, a dice, a book, etc are encountered.  All these objects have a similar shape. In fact, all these objects are made of six rectangular planes  or square planes . In Mathematics,  the shape of these objects is either a  cuboid or cube . Definition: Imagine objects like a lunch box, television set, shoebox, carton box, bricks, book, mattresses and you would know what a cuboid is and how it looks. These shapes are cuboid. Like said, a cuboid is a 3-D geometrical object which consists of 6 rectangular faces. All angles of a cuboid are right angles and faces opposite to each other are equal. A cuboid is also known as a rectangular solid or a rectangular prism. In a cuboid, the length, width and height may be of different measurements. Is Cube a Cuboid? Objects such as Rubik’s cube, ice, dice, Sudoku, sugar cubes, casseroles and milk crates etc are examples of anot

  Quadrilateral    Quadrilateral A quadrilateral is a closed shape and a type of polygon that has four sides, four vertices and four angles. It is formed by joining four non-collinear points. The sum of interior angles of quadrilaterals is always equal to 360 degrees.  The polygon has four vertices or corners.   We can find the shape of quadrilaterals in various things around us, like in a chess board, a deck of cards, a kite, a tub of popcorn, a sign board and in an arrow.     Types of Quadrilaterals The types of quadrilaterals are defined based on the measure of the angles and lengths of their sides. As the word ‘Quad’ means four, all these types of a quadrilateral have four sides, and the sum of angles of these shapes is 360 degrees. The list of types of quadrilaterals are: 1. Trapezium 2. Parallelogram 3. Squares 4. Rectangle 5. Rhombus 6. Kite      Name of the Quadrilateral: Properties of the Quadrilateral:  Parallelogram Opposite sides are parallel.  Opposites s

  TRIANGLE Geometry, a triangle is a three-sided polygon that consists of three edges and three vertices.  The most important property of a triangle is that the sum of the internal angles of a triangle is equal to 180 degrees DEFINITION As we discussed in the introduction, a triangle is a type of polygon, which has three sides, and the two sides are joined end to end is called the vertex of the triangle.  An angle is formed between two sides. This is one of the important parts of geometry. Types On the basis of length of the sides, triangles are classified into three categories: 1.       Scalene Triangle 2.       Isosceles Triangle 3.       Equilateral Triangle On the basis of measurement of the angles, triangles are classified into three categories: 1.       Acute Angle Triangle 2.       Right Angle Triangle 3.       Obtuse Angle Triangle Scalene Triangle A scalene triangle is a type of triangle, in which all the three sides have different side measures.  Due to this, the three angles