Example 4 - Chapter 3 Class 11 Trigonometric Functions
Last updated at August 17, 2026 by Teachoo
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Chapter 3 Class 11 Trigonometric Functions
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Transcript
Example 4 The minute hand of a watch is 1.5 cm long. How far does its tip move in 40 minutes? (Use Ο = 3.14). We know that π = r ΞΈ Here, r = minute hand of clock = 1.5 cm Finding Angle π Now we know that Minute hand make 1 revolution in 1 hour Hence we can say that, Minute hand completes 360Β° in 1 hour So, Degree completed in 1 minute = πππ/ππΒ° Degree completed in 40 minute = 360/60 Γ 40Β° = 240Β° Converting degree into radians ΞΈ = 240Β° = 240Β° Γ π /(πππΒ°) = ππ /π Putting values in formula ΞΈ "= " π/π " " π = r ΞΈ = 1.5 Γ ππ /π = 0.5 Γ 4π = 2π = 2 Γ 3.14 = 6.28 cm
