Question

Perform a 45 degree rotation of triangle a(1 1) b(2 3) c(5 2)
a)about the origin
b) P (-1, -1)

Answer 1

hope it will help you

Answer 2

"About the origin 45 degree rotation of triangle a (1,1), b(2,3), c(5,2) will be performed. Here the detailed explanation

· Using the homogeneous coordinates of the vertices you have to represent the triangle values in matrix

· Then find the matrix of rotation of 45°.  

· After that apply concept of trigonometric ratios which should like $\cos { 45 } \quad =\quad \sin {45} \quad =\quad \frac { 1 }{ \sqrt { 2 }  }$

· After that multiply matrix of triangle value and matrix of rotation."