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KCC's Quizzes AQQ230 about a clock and angle puzzle

In an analog clock, the angle formed by the hour and the minute hands varies constantly.

Questions:

  1. Which angle θ is obtained when it is 5:20 ?
  2. Determine when exactly at around 4, the angle will be exactly 90°?


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[edited by: emassa at 1:54 PM (GMT -4) on 29 Mar 2023]
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  • 1. Theta=40°

    2. There are two solutions

    2a: Between 4:05 and 4:06

    2b: between 4:38 and 4:39

    Given h=hours and m=minutes, you can write the follwing equations for the angle alpha the minute hand forms with the "vertical" and the angle beta the hour hand forms with the vertical

    alpha=6*m

    beta= 30*h + 0.5m  

Reply
  • 1. Theta=40°

    2. There are two solutions

    2a: Between 4:05 and 4:06

    2b: between 4:38 and 4:39

    Given h=hours and m=minutes, you can write the follwing equations for the angle alpha the minute hand forms with the "vertical" and the angle beta the hour hand forms with the vertical

    alpha=6*m

    beta= 30*h + 0.5m  

Children