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Example 10 - Each side of a regular polygon is 2.5 cm in length

Example 10 - Chapter 2 Class 7 Fractions and Decimals - Part 2


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Example 11 A car covers a distance of 89.1 km in 2.2 hours. What is the average distance covered by it in 1 hour?Distance covered in 22 hours = 89.1 km Distance covered in 1 hours = 89.1/2.2 km = 891/22 = 40.5 So, Distance covered by car in 1 hour = 40.5 km Example 10 Each side of a regular polygon is 2.5 cm in length. The perimeter of the polygon is 12.5cm. How many sides does the polygon have?Given that Length side = 2.5 cm Perimeter = 12.5 cm Now, Perimeter = Sum of all sides Perimeter = Number of sides × Length of sides 12.5 = Number of sides × 2.5 12.5/2.5 = Number of sides Number of sides = 12.5/2.5 Number of sides = (125/10)/(25/10) Number of sides = 125/10 "÷" 25/10 Number of sides = 125/10 ×10/25 Number of sides = 125/25 Number of sides = 25/5 Number of sides = 5 So, polygon has 5 sides

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.