what I faced challenging in chapter mensuration class 6 maths
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Mathematics NCERT Grade 6, Chapter 10: Mensuration- This chapter will cover all the concepts of Perimeter and Area. Perimeter is the distance covered along the boundary forming a closed figure when you go around the figure once. The amount of surface enclosed by a closed figure is called its area. Figures in which all sides and angles are equal are called regular closed figures.The first part of the chapter covers the following topics:
1. Perimeter of a rectangle = 2 × (length + breadth)
2. Perimeter of square = 4 × length of a side
3. Perimeter of an equilateral triangle = 3 × length of a side
Next part of the chapter emphasises on area.
The first method explained is Calculation of area by counting squares.To calculate the area of a figure using a squared paper, the following conventions are adopted:(a) The area of one full square is taken as 1 sq unit. If it is a centimetre square sheet, then area of one full square will be 1 sq cm.
(b) Ignore portions of the area that are less than half a square.
(c) If more than half a square is in a region. Count it as one square.
(d) If exactly half the square is counted, take its area as 1/2 sq units.
Another method is direct formula based method. Area of a rectangle = length × breadth Area of a square = side × sideUnsolved questions based on the above-cited topics.
Assessment of these concepts can be done by solving exercises 10.1, 10.2 and 10.3. Exercise 10.2 is a short exercise containing only one question.
Solved examples are covered in the chapter to make the students understand each topic in a crystal clear way.
Summarization of all important points is done at the end of the chapter- Mensuration