The angle between the minute hand and the hour hand of a clock when th...
The angle between hour and minute hand in 4:20 is 10 degrees.
For a minute, the hour hand rotates by 30/60 = 1/2 degrees.
hence, for 20 minutes it rotates by an angle of 20*1/2 = 10 degrees.
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The angle between the minute hand and the hour hand of a clock when th...
Problem: The angle between the minute hand and the hour hand of a clock when the time is 4.20 is:
a) 00
b) 100
c) 50
d) 200
Solution:
To solve this problem, we need to find the angle between the minute hand and the hour hand of a clock at 4:20.
Calculating the positions of the hour and minute hands:
We know that a clock completes a full circle in 12 hours or 360 degrees. Therefore, in 1 hour, the hour hand moves 30 degrees (360/12). In 1 minute, the hour hand moves 0.5 degrees (30/60).
In 4 hours, the hour hand would have moved:
4 hours × 30 degrees/hour = 120 degrees
In 20 minutes, the hour hand would have moved:
20 minutes × 0.5 degrees/minute = 10 degrees
So, at 4:20, the hour hand is at the position 120 degrees + 10 degrees = 130 degrees.
The minute hand moves 360 degrees in 60 minutes, so in 1 minute, it moves 6 degrees (360/60).
In 20 minutes, the minute hand would have moved:
20 minutes × 6 degrees/minute = 120 degrees
So, at 4:20, the minute hand is at the position 120 degrees.
Calculating the angle between the hour and minute hand:
To calculate the angle between the hour and minute hand, we need to find the difference between their positions.
Angle = |Position of the hour hand - Position of the minute hand|
Angle = |130 degrees - 120 degrees|
Angle = 10 degrees
Therefore, the angle between the minute hand and the hour hand at 4:20 is 10 degrees.
Conclusion:
The correct answer is option b) 100.
The angle between the minute hand and the hour hand of a clock when th...
(11*20-60*4)/2= 10