Transformations of Triangles and Coordinates

Mr. Dell explains a dilation problem from CPM Course 3, focusing on transforming triangle ABC by multiplying its coordinates by -2. He identifies the original coordinates, calculates the new coordinates for A', B', and C', and graphs the new triangle. The analysis reveals that the triangle's size doubled, and it rotated around both the x and y axes.

What is the main mathematical concept being discussed in the video?

• Translation

• Reflection

• Dilation

• Rotation

From which course is the problem being discussed sourced?

• CPM Course Three

• CPM Course Four

• CPM Course Two

• CPM Course One

What operation is performed on the coordinates of triangle ABC?

• Division by 2

• Multiplication by -2

• Subtraction by 2

• Addition by 2

What are the original coordinates of point A?

• (-2, -2)

• (0, 0)

• (-3, 2)

• (1, 2)

What is the first step in solving the dilation problem?

• Calculate the original coordinates

• Graph the new triangle

• Describe the change

• Multiply coordinates by -2

What is the expression used to transform the coordinates?

• 2x, 2y

• -2x, -2y

• x/2, y/2

• x+2, y+2

What is the significance of using primes in the new coordinates?

• To mark a rotation

• To denote a transformation

• To show a reflection

• To indicate a new shape

What is the result of multiplying the x-coordinate of point A by -2?

• -6

• 3

• 6

• -3

What is the result of multiplying the y-coordinate of point A by -2?

• 4

• 2

• -2

• -4

What is the result of multiplying the x-coordinate of point B by -2?

• -4

• 4

• -2

• 2