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#1 2012-10-23 21:48:05

Harold
Guest

Rotation in graph

Suppose I have a triangle with coordinates (1,1),(3,1),(2,2) and I want to rotate them 80 degrees so that they stay at same distance from origin,what will be the rotated triangle's coordinates?how do I find them?

#2 2012-10-23 21:54:52

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,269

Re: Rotation in graph

hi Harold,

Can you do matrix multiplication?

The matrix


multiplied by your coordinates written as vectors:

will do the trick.

MathsIsFun has a matrix calculator at

http://www.mathsisfun.com/algebra/matri … lator.html

Choose option AB.
Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#3 2012-10-23 22:08:27

Harold
Guest

Re: Rotation in graph

Thank you,but i can do matrix multiplication and i have got my answer.

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