Rotate A(3,-1), B(4,-1), C(4,-5) 90 degrees clockwise around (2,-1)
Step 1 , translate so that the rotation point is the origin, by subtracting (2,-1)
A''(1, 0), B''(2, 0), C(2, -4)
Step 2, rotate 90 degrees clockwise. (x,y) becomes (y,-x)
A'''(0,-1), B'''(0, -2), C'''(-4, -2)
Step 3, translate back, adding (2,-1)
A'(2, -2), B'(2, -3), C'(-2,-3)
Answer: Draw the triangle with vertices (2, -2), (2, -3), (-2,-3)