Rotate the given triangle 90° counter-clockwise about the
origin [ 0 -3 5]
[0 1 2 ]

9514 1404 393

Step-by-step explanation:

The rotation matrix for 90° CCW is ...

Then the rotated coordinates are ...

_____

The transformation of each ordered pair is ...

  (x, y) ⇒ (-y, x)

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b