Question

△QRS is mapped to △Q'R'S' using the rules (x, y)→(−x, y) followed by (x, y)→(x−1, y+2) .

Answer 1

â–łQRS is congruent to â–łQ'R'S' because the rules represent a reflection followed by a translation, which is a sequence of rigid motions. The transformation (x, y)→(â’x, y) is a reflection across the x-axis. The transformation (x, y)→(xâ’1, y+2) is a translation. No scaling or skewing is being performed. With that in mind, let's look at the options. â–łQRS is congruent to â–łQ'R'S' because the rules represent a reflection followed by a translation, which is a sequence of rigid motions. * Not much to say. It's completely true. So this is the correct choice. â–łQRS is not congruent to â–łQ'R'S' because the rules do not represent a sequence of rigid motions. * The rigid motions are translation, rotation, reflection, and glide reflection (which is a special case of reflection followed by a very specific translation). We performed only a reflection and a translation, which are both rigid motions. So this choice is a bad one. â–łQRS is congruent to â–łQ'R'S' because the rules represent a reflection followed by a rotation, which is a sequence of rigid motions. * We didn't perform a rotation. So this is a bad choice. â–łQRS is congruent to â–łQ'R'S' because the rules represent a translation followed by a rotation, which is a sequence of rigid motions. * We performed a reflection, followed by a translation. So once again, a bad choice.