Which statement explains why triangle ABC…

Maths Questions

Which statement explains why triangle ABC is congruent to triangle A’B’C’? You can map triangle ABC onto triangle A’B’C’ by reflecting it across the line y = x and rotating it 90 degrees counterclockwise about the origin, which is a sequence of rigid motions. You can map triangle ABC onto triangle A’B’C’ by reflecting it across the x-axis and then across the y-axis, which is a sequence of rigid motions. You can map triangle ABC onto triangle A’B’C’ by translating it 2 units up and reflecting it across the y-axis, which is a sequence of rigid motions. You can map triangle ABC onto triangle A’B’C’ by translating it 6 units left and reflecting it over the x-axis, which is a sequence of rigid motions. Triangle ABC has vertices A(1, -3), B(5, 3), and C(4, -1). Triangle A’B’C’ has vertices A'(-5, 3), B'(-1, -3), and C'(-2, 1).

Answer

The correct choice is: You can map triangle ABC to triangle A’B’C’ by translating it 6 units to the left and reflecting it over the x-axis, which consists of a sequence of rigid motions. Explanation: The coordinates for triangle ABC are A(1, -3), B(5, 3), and C(4, -1). For triangle A’B’C’, the coordinates are A'(-5, 3), B'(-1, -3), and C'(-2, 1). Each point from triangle ABC corresponds to a point in triangle A’B’C’: A(1, -3) maps to A'(-5, 3), B(5, 3) maps to B'(-1, -3), and C(4, -1) maps to C'(-2, 1). When we compare the x-coordinates, we see the image’s x-coordinates are exactly 6 less than those of the pre-image: 1 – 6 = -5, 5 – 6 = -1, 4 – 6 = -2. This indicates that the figure has been translated 6 units to the left. When we look at the y-coordinates, we see that the values are negated: -(-3) = 3, -(3) = -3, -(-1) = 1. This shows that the pre-image was reflected over the x-axis, which flips the y-coordinates while retaining the x-coordinates. These transformations are classified as rigid motions since they preserve the shape and size of the triangle while changing its position and orientation.

Scroll to Top