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Question
The length of the minutes hand of a wall clock is 6cm. find the distance covered by the tip of the minutes hand in 25 minutes.
The length of the minutes hand of a wall clock is 6cm. find the distance covered by the tip of the minutes hand in 25 minutes.
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Solution
The circumference of a circle with radius 6 cms is 12π cm
In 25 minutes the tip moves (25/60)12π = 5π cm
you can also use the formula s = rθ
θ is the angle of rotation.
25 minutes is equivalent to 25/60 x 360 degrees = 150 degrees = 5π/6 radians
Both are correct answers.
In 25 minutes the tip moves (25/60)12π = 5π cm
you can also use the formula s = rθ
θ is the angle of rotation.
25 minutes is equivalent to 25/60 x 360 degrees = 150 degrees = 5π/6 radians
Both are correct answers.
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