Triangle abc is transformed to form triangle a'b'c' . a is at (2, 4) , b is at (3, 9) and c is at (4, 1) . which transformation of △abc results in △a'b'c' ? drag and drop the the correct answers into the each box to complete the sentence.

From the picture attached, you can see that:
A'(-3, -1)
B'(-1, -8)
C'(-7, -2)

Therefore, the transformation is:
x' = -x
y' = -y

These functions represent a rotation of 180° about the origin.

Therefore ΔABC is rotated counterclockwise 180° about the origin to form ΔA'B'C'.