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 Post subject: Centre of rotationPosted: Sat Jan 14, 2012 10:04 pm

Joined: Fri Mar 18, 2011 9:47 am
Posts: 173
DS is doing (y6) online school homework on rotation but is stuck on finding centre of rotation coordinates. Where two shapes are rotated on a grid he can work out the degree of rotation and whether clockwise anti-c...but the next question is what is the centre of rotation. How do you work this out? Any help appreciated.

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 Post subject: Re: Centre of rotationPosted: Sat Jan 14, 2012 10:12 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 13992
At that age I'd expect tracing paper and guess work - putting a pencil on the possible centre and trying it.

The correct method for GCSE is to join corresponding points and find the perpendicular bisector of two them - where these intersect is the centre. This uses the fact that each point remains the same distance from the centre after a rotation.

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 Post subject: Re: Centre of rotationPosted: Sun Jan 15, 2012 3:48 pm

Joined: Fri Mar 18, 2011 9:47 am
Posts: 173
Thanks Guest 55

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