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Slide51.JPG

  1. Chapter 11 Class 7 Perimeter and Area
  2. Serial order wise

Transcript

Ex 11.3, 17 The minute hand of a circular clock is 15 cm long. How far does the tip of the minute hand move in 1 hour. (Take π = 3.14) Here, Distance moved by minute hand in 1 hour = Circumference of circle made by minute hand Radius = r = 15 cm Circumference = 2𝜋r = 2 × 3.14 × 15 = 3.14 × 2 × 15 = 314/100 × 30 = 314/10 × 3 = 942/10 = 94.2 cm ∴ Minute hand moves 94.2 cm in one hour

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.