Math Is Fun Forum

dazzle1230

Member

Registered: 2016-05-17

Posts: 92

Geometry

Help on this question:

The second hand on the clock pictured below is 6 cm long. How far in centimeters does the tip of this second hand travel during a period of 30 minutes? Express your answer in terms of pi.

zetafunc

Moderator

Registered: 2014-05-21

Posts: 2,432

Website

Re: Geometry

Can you determine the circumference of the clock?

MathWA

Member

From: Somewhere over the rainbow

Registered: 2016-05-22

Posts: 12

Website

Re: Geometry

Where is the picture?

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We cannot solve our problems with the same thinking we used when we created them.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,140

Re: Geometry

hi dazzle1230

The second hand is the radius  and it sweeps out circles as time passes.  So firstly work out the circumference of that circle (2 times pi times radius) then work out how many circuits it will do in that time .  One per minute. Don't use 3.14 or other for pi ... just leave the answer a N.pi where N is a number.

Bob

MathWA: I don't see the picture either, but, do you really need it for this question? 

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Relentless

Member

Registered: 2015-12-15

Posts: 631

Re: Geometry

Quite a distance (:

Last edited by Relentless (2016-05-22 20:50:21)

Bob

Administrator

Registered: 2010-06-20

Posts: 10,140

Re: Geometry

hi Relentless

Thanks for posting that.  It made me check and edit my hint.  Please read my corrected version.

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

dazzle1230

Member

Registered: 2016-05-17

Posts: 92

Re: Geometry

Thanks for the help!!!