Flipping a Triangle: Author's Purpose

Read about reflections on the coordinate plane, then work out why the author wrote it.

Story Brief #410

Transformations in geometry involve changing the position or size of a shape on a coordinate plane.

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Read carefully. Then prove you understood.

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Slow down. The first answer that pops up isn't always the right one.

📖 1 of 2

Transformations in geometry involve changing the position or size of a shape on a coordinate plane. One type of transformation is a reflection, which flips a shape over a line, known as the line of reflection. For example, if you have a triangle with vertices at (1, 2), (3, 2), and (2, 4), and you reflect it over the y-axis, the new vertices will be (-1, 2), (-3, 2), and (-2, 4). This means that each point on the triangle moves to a position that is the same distance from the y-axis but on the opposite side.

📖 2 of 2

Reflections maintain the size and shape of the original figure, meaning the triangle remains congruent after the transformation. Reflections can occur over other lines, such as the x-axis or any diagonal line, creating interesting patterns and designs.

Question 1

1 of 2

Why did the author most likely write this passage?

How sure are you going to be?😐 maybe

Question 2

2 of 2

Which sentence did the author write in this passage?

How sure are you going to be?😐 maybe

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You got 0 of 2 right.

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