Question

Triangle PQR is shown below.

If triangle PQR were reflected across the y-axis to create triangle P'Q'R', what would the length of P'R' be?
A. 10 units
B. 8 units
C. 6 units
D. 12 units

Answer 1

Answer: OPTION B.

Explanation:

By definition, reflection is a kind of transformation in which the lengths do not change.

As you can see in the figure, the length of PR is 8 units. Then, keeping on mind the definition, when the triangle PQR was reflected across the y-axis, the triangle P'Q'R' obtained has the same lenghts as the triangle PQR.

Therefore, you can conclude that the lenght P'R' would be: 8 units.