NCERT Class 7 Mathematics Solutions: Chapter 2 – Fractions and Decimals Exercise 2.1 Part 5

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Given this figure Rectangle formulas

Rectangle Formulas

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Question 5: Find the perimeter of (i) (ii) the rectangle BCDE in this figure. Whose perimeter is greater?

Triangle ABC, rectangle BCDE

Triangle ABC, Rectangle BCDE

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Answer:

(1)

Given,

So,

The perimeter of

The perimeter of

(2)

Given,

So,

Perimeter of rectangle = 2 (length + breadth)

= 2(BE+CD)

In rectangle BCDE

Comparing the perimeter of triangle and that of rectangle,

The perimeter of , in rectangle BCDE

Therefore, the perimeter of triangle ABE is less than that of rectangle BCDE.