At 4.46p.m., Jack looks at his clock. He finds that the smaller angle between the hour hand and the minute hand is x ∘ .
Find x
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the angle between hr and min hand is given by | 30H-(11/2)M |
so ,| 30x4 - 11/2x 46 |=133
My idea of solution:
Each marker on the clock is equivalent to 6º (360º/60 minutes = 6º). So, from 45 minutes to 46 minutes we have 6 º . Then, from 6 hours to 9 hours we have 9 0 º (the minute hand is after 9 hour marker and the hour hand is before 6 hour marker). Then we have to calculate the position of the hour hand (as we know, the hour hand shifts accordingly to the amount of minutes passed). From 5 hours to 6 hours we have 5 markers, or so, 3 0 º . Within the hour 4, we have 5 markers too.To know the exact proportion, we can do the following rule of three (knowing that 46 minutes are equivalent to 276º):
2 7 6 º 3 6 0 º × x 3 0 º x = 3 6 0 8 2 8 0 x = 2 3 º
So, we subtract 23 from 30 and we get 7 º remaining to 5 hours.
Adding them all up:
6 º + 9 0 º + 3 0 º + 7 º = 1 3 3 º
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Good solution,it is better to use your own brains and solve rather than using formulas.
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brother, then does this comment of yours means that u dont use pythagoras theorem relation, area of triangle formula, quadratic formula etc etc ...... "FORMULAS are derived by those who used their brains and it is being understood by those who have brains" .... only some mug it up ... and this comment is kinda hurting to all those who love maths
But then what I did was wrong could some one tell me where I'm thinkin' wrong here:
1min=6 degrees 4 corresponds to 20 minutes thus 46-20=26 and therefore 26*6=156
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You have retained the hour hand at 4 PM, which it be little further than 3/4th of the way down to next marker ie 5 PM. Hope this clarifies the metter
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