Math Is Fun Forum

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?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,648

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

---

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

Harold

Guest

Re: Rotation in graph

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