Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**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: 7,013

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

Offline

**Harold****Guest**

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

Pages: **1**