Question 1 (b) - Figure it out - Page 84, 85 - Chapter 4 Class 7 - Expressions using Letter-Numbers (Ganita Prakash)

Last updated at August 14, 2026 by

[Class 7] Write formulas for the perimeter of: (b) a regular pentagon - Figure it out - Page 84, 85

part 2 - Question 1 (b) - Figure it out - Page 84, 85 - Chapter 4 Class 7 - Expressions using Letter-Numbers (Ganita Prakash) - Class 7 (Ganita Prakash 1, 2 & old NCERT)

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Transcript

Question 1 (b) Write formulas for the perimeter of: (b) a regular pentagon (as we have learnt last year, we use the word ‘regular’ to say that all sidelengths and angle measures are equal) We know that Pentagon has 5 sides Here we talk about Regular pentagon Regular pentagon has all sides equal ∴ AB = BC = CD = DE = AE = a Now, Perimeter = Sum of all sides = AB + BC + CD + DE + AE = a + a + a + a + a = 5a

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