Example 4
Last updated at Dec. 8, 2016 by Teachoo
Transcript
Example 4 The minute hand of a watch is 1.5 cm long. How far does its tip move in 40 minutes? (Use ฯ = 3.14). We know that ๐ = r ฮธ Hence, r = minute hand of clock = 1.5 cm Now we know that Minute hand make 1 revolution in 1 hour and Hence we can say that Minute hand complete 360o in one hour So degree complete in 1 minute = 360/60 So degree complete in 40 minute = 360/60 ร 40o = 240o Hence ฮธ = 240o = 240o ร ๐/(180ยฐ) = 4๐/3 Now Putting values in formula ๐ = r ฮธ = 1.5 ร 4๐/3 = 0.5 ร 4๐ = 2๐ = 2 ร 3.14 = 6.28 cm
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About the Author
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.