Question

8. Find the congruence transformation that maps ∆ABC to ∆A’B’C’. Explain your reasoning

Answer 1

reflection over the y-axis, because all the x's changed from negative to positive, and the y's stayed the same.

Answer 2

Answer: Reflection across y axis.

Explanation:

From the given picture, it can be seen that ∆A’B’C’ is the mirror image of ∆ABC.

Thus the transformation used here is reflection.

Since, the y coordinate of the corresponding vertices of both the triangles are exactly same . But the polarity of x coordinates changes.

It implies that all the corresponding points of both the triangles area equidistant from the y axis.

i.i. the line of reflection = y axis.

Hence, the used here is "Reflection across y axis".