On this page, you will find Perimeter and Area Class 7 Notes Maths Chapter 11 Pdf free download. CBSE NCERT Class 7 Maths Notes Chapter 11 Perimeter and Area will seemingly help them to revise the important concepts in less time.
CBSE Class 7 Maths Chapter 11 Notes Perimeter and Area
Perimeter and Area Class 7 Notes Conceptual Facts
1. Perimeter is the actual distance around a closed figure.
2. Perimeter of a regular polygon = Number of sides x Length of one side
3. Perimeter of a square = 4 x side
4. Perimeter of a triangle = AB + BC + CA (Sum of all sides of triangle)
5. Perimeter of a rectangle = 2 [length + breadth]
= 2(l+ b)
6. Circumference of a circle is the actual distance around it.
7. Ratio of the circumference and the diameter of a circle is a constant
8. The numerical value of π is taken as \(\frac{22}{7}\) or 3.14. (approximate)
9. Circumference of a circle = 2πr, where r is the radius of the circle.
10. Area of a rectangle = length x breadth = l x b
11. Area of a triangle = \(\frac{1}{2}\) x base x height = \(\frac{1}{2}\) x b x h
12. Area of circle = πr2, where r is the radius of the circle.
13. Area of a parallelogram = base x height
14. Area of a square = (Side)2 = l2
Conversion of units
