CPM Geometry Chapter 8

What are the coordinates of B' after a 270° clockwise?

• (4, 4)

• (4, -4)

• (-3, 4)

• (-4, 4)

Reflect ΔXYZ over the y-axis.

X(0 , -3) ; Y(-2 , 4) ; Z(1 , 3)

• X'(0 , 3) ; Y'(-2 , -4) ; Z'(1 , -3)

• X'(0 , -3) ; Y'(2 , 4) ; Z'(-1 , 3)

• X'(-3 , 0) ; Y'(4 , -2) ; Z'(3 , 1)

• X'(0 , -3) ; Y'(-2 , 4) ; Z'(-1 , 3)

Rotate ΔPQR 90^o counterclockwise about the origin.

P(-5 , 2) ; Q(1 , 5) ; R(3 , -2)

• P'(-2 , -5) ; Q'(-5 , 1) ; R'(2 , 3)

• P'(2 , -5) ; Q'(5 , 1) ; R'(-2 , 3)

• P'(2 , 5) ; Q'(5 , -1) ; R'(-2 , -3)

• P'(-2 , 5) ; Q'(-5 , -1) ; R'(2 , -3)

We have not talked about a dilation yet- but a dilation can either increase or decrease the size of and object. The center of dilation is the origin. Dilate ΔEFG given a scale factor of 3. (enlarge by a factor of 3) Here are the vertices: E(4 , 9) ; F(-3 , 12) ; G(2 , -8)

• E'(4/3 , 3) ; F'(-1 , 4) ; G'(2/3 , -8/3)

• E'(12 , 27) ; F'(-9 , 36) ; G'(6 , -24)

• E'(7 , 12) ; F'(0 , 15) ; G'(5 , -5)

• E'(1 , 6) ; F'(-6 , 9) ; G'(-1 , -11)

A Triangle has vertices at A (1,3), B (2,4), and C (3,8). Which transformation would produce an image with vertices A'(3,-1), B'(2,-4), C'(8,-3)?

• Reflection over X Axis

• Reflection over Y Axis

• 90 degree CW rotation

• 90 degree CCW rotation

Reflect the shape over the line y = x. Where is A'?

• (7, 2)

• (-2, 7)

• (2, -7)

• (-7, -2)

Which answer shows a reflection across the x-axis?

• d

• c

• b

• a

A turn is also called a ___________.

• Translation

• Reflection

• Rotation

• Transformation

The slopes of parallel lines are...

• the same

• opposite

• always different

Slopes of parallel lines are...

• negative reciprocals.

• opposites.

• the same.

• always 7.