Example 6 - Chapter 2 Class 7 Fractions and Decimals

Transcript

Example 6 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