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