# Lesson 4

Coordinate Moves

Let’s transform some figures and see what happens to the coordinates of points.

### Problem 1

1. Here are some points.

What are the coordinates of $$A$$, $$B$$, and $$C$$ after a translation to the right by 4 units and up 1 unit? Plot these points on the grid, and label them $$A’$$, $$B’$$ and $$C’$$.

2. Here are some points.

What are the coordinates of $$D$$, $$E$$, and $$F$$ after a reflection over the $$y$$ axis? Plot these points on the grid, and label them $$D’$$, $$E’$$ and $$F’$$.

3. Here are some points.

What are the coordinates of $$G$$, $$H$$, and $$I$$ after a rotation about $$(0,0)$$ by 90 degrees clockwise? Plot these points on the grid, and label them $$G’$$, $$H’$$ and $$I’$$.

### Problem 2

Describe a sequence of transformations that takes trapezoid A to trapezoid B.

(From Unit 1, Lesson 3.)

### Problem 3

Reflect polygon $$P$$ using line $$\ell$$.

(From Unit 1, Lesson 3.)