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55m 34s
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2D Mensuration: Introduction
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This is introductory lesson of the 2D figure mensuration. This lesson highlights the formula of different 2D figures of area and perimeter.

Manish Pandey
I am an engineer, educator at unacademy, aspire to be a government officer. Love to play badminton , watch football ,cook and eat.

U
400 years contain 20+1 & therefore 0 odd days. yaha pe +1 kyu likh gya hai.
Small correction needed on slide no 3 for perimeter of parallelogram.
Manish Pandey
2 years ago
yess !! i have mistyped + as x !! the perimeter of parallelogram = 2(a+b)
1. ABOUT ME Manish Pandey Electrical Engineer . Work as Educator at Unacademy Follow me on unacademy https://unacademy.com/user/buntymanish07 If you like the lesson review and rate it and drop any query regarding the related course I'll answer that definitely.

2. Mensuration -20 Area is the amount of 2-D space taken by an object. . The length of border around any 2-D object is called perimeter. . In this course we will learn about area of different 2-D shapes. .Questions are often asked from this topic.

3. Quadrilateral .Parallelogram |Area = Base height = b h 2 Perimeter = 2(a b) .Rhombus 2. Perimeter = 4a Rectangle 1, Area = 1 b 2. Perimeter = 2(1 + b) * Square 1. Area = a2 2. Perimeter = 4a . Trapezium Area-asum of parallel sides height =-(a + b) h

4. Triangle Heron's formula Area = Vs(s-a) (s-b) (s-c) where, s = a+b+c Area of right angled triangle 1 Area = base height =- b h 2

5. Circle Area of circle A = 2 Area of sector A =- . Tr2 360 Circumference of circle C = 2 r Circumference of sector C- 2 360

6. Points to Remember When problems related related to fencing or making boundary are considered, then rate is multiplied by perimeter . When problems related grazing, tiling and painting are considered area is multiplied by the given rate.