Clock Angles - 1

Geometry Level 2

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 x^{\circ} .

Find x x


The answer is 133.

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2 solutions

Ramiel To-ong
Sep 15, 2015

USING FOX'S FORMULA FIND MY FACEBOOK, I POST IT..

Aditya Ranjan
Aug 24, 2014

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 \boxed{6º} . Then, from 6 hours to 9 hours we have 90 º \boxed{90º} (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, 30 º \boxed{30º} . 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):

360 º 276 º × 30 º x \frac{360º}{276º} \times \frac{30º}{x} x = 8280 360 x = \frac{8280}{360} x = 23 º x = 23º

So, we subtract 23 from 30 and we get 7 º \boxed{7º} remaining to 5 hours.

Adding them all up:

6 º + 90 º + 30 º + 7 º = 133 º 6º + 90º + 30º + 7º = \boxed{133º}

João Arruda - 6 years, 9 months ago

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Good solution,it is better to use your own brains and solve rather than using formulas.

Anuj Shikarkhane - 6 years, 7 months ago

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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

Ganesh Ayyappan - 6 years, 5 months ago

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

epic dude - 6 years, 7 months ago

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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

Ramesh Padmanabhan - 6 years, 4 months ago

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