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**Harold****Guest**

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?

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,859

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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**Harold****Guest**

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

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