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What is the angle between the hour and minute hand when it is 4:20?

Sagot :

[tex]Look\ at\ the\ picture.\\\\\beta=360^o:12=30^o\\\\\frac{20min}{1h}=\frac{20min}{60min}=\frac{1}{3}\\\\\alpha=\frac{1}{3}\cdot30^o=10^o\leftarrow answer[/tex]
View image Аноним
AL2006
The arc between the 4 and the 5 is (360/12) = 30 degrees.

The hour hand takes a full hour to creep from the 4 to the 5, so it moves
at the rate of ( 30 degrees / 60 minutes ) = 1/2 degree per minute.

In 20 minutes, the hour hand moves (20 x 1/2) = 10 degrees.

At 4:20 , the minute hand is right square on the 4, and the hour hand
is 10 degrees ahead, on its way to the 5 .

The angle between them is 10 degrees. 
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