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# RD Sharma Class 7 Solutions Chapter 20 - Mensuration I (Perimeter and Area of Rectilinear Figures) ## Free PDF download of RD Sharma Class 7 Solutions Chapter 20 - Mensuration I (Perimeter and Area of Rectilinear Figures)

Free PDF download of RD Sharma Class 7 Solutions Chapter 20 - Mensuration I  (Perimeter and Area of Rectilinear Figures)  Exercise 20.2 solved by Expert Mathematics Teachers on Vedantu.com. All Chapter 20 - Mensuration I Ex 20.2 Questions with Solutions for RD Sharma Class 7 Maths to help you to revise the complete Syllabus and Score More marks.

Last updated date: 28th May 2023
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## Below is a List of a Few Points That are Covered in This Lesson.

• Units of measurement of area: A two-dimensional shape's area is measured in square units. In SI, the area is measured in square metres (m2), which is derived from the SI definition. The other units used  for  area are

• Square millimetre

• Square centimetre

• Square decimeter

• Square metre

• Hectare

• Square kilometre

• Perimeter and area of squares and rectangles: In mathematics, a rectangle's perimeter is defined by the formula P=2l+2b, where l is the rectangle's length and b is its width. The area of a rectangular shape A is given by the formula, A=lb, where l is the length and b is the width of the rectangle.

• The perimeter of rectangles: The perimeter of a rectangle is the length of all its 4 sides. Formula to calculate the perimeter of a rectangle is:

Perimeter of Rectangle  =  2  ×  Length  +  2  ×  Breadth

Areas of a parallelogram: The area of a parallelogram is defined as the area enclosed by a parallelogram in two dimensions. In case you don't recall, a parallelogram is a quadrilateral with four sides where the sides are parallel to each other. There is an equal length on both sides and equal angles on opposite angles in a parallelogram. A rectangle's area is equal to a parallelogram's area because both have similar characteristics.

Area = b × h Square units

• Area of a triangle: Three sides of a triangle occupy the same space in a two-dimensional plane, so the area of a triangle is the total space occupied by its three sides. In basic formulae, the area of a triangle equals half its base plus half its height.

A = (½) × b × h.

### The Benefits of  RD Sharma Class 7 Maths Solutions

There are many reasons why students who are finding it difficult to solve complex problems should study the RD Sharma Class 7 Maths Solutions for Chapter 20 - Mensuration - I. There are links below that students can use to refer to the RD Sharma Solutions for Class 7 Maths, Chapter 20 PDF. For students to better understand the concepts presented in the textbook, we have presented all solutions here in a clear and detailed manner. This chapter is devoted to measuring the perimeters and areas of rectangular figures.

Rd Sharma covers all the important topics in the chapter in detail. Students can prepare thoroughly with the proper understanding of the concepts.

Some of the topics in this chapter are Units of measurement of area, Square millimetre, Square centimetre, Square decimeter, Square metre, Hectare, Square kilometre, Perimeter and area of squares and rectangles, Area between rectangles, Areas of a parallelogram and rhombus, Area of a triangle.