Chapter 2 - Open up resources Grade 8 math

Is B a scaled copy of R? What is the scale factor?

• Yes, 1/4

• No, No

• No, 1/4

• Yes, 1/8

Is C a scaled copy of B? What is the scale factor?

• No, no

• No, 1/9

• Yes, 1/9

• Yes, 1/8

Is C a scaled copy of R? What is the scaled factor?

• No, 1/34

• yes, 1/36

• yes, 1/24

• no, 1/36

Find the dilation of triangle QRS with a center T and it's scale factor is 2.

Answer explanation

Your triangle should be twice as big as triangle QRS.

Find the dilation of triangle QRS with Center T and a scale factor 1/2.

Quadrilateral ABCD is dilated with center (0,0). Draw a new Quadrilateral starting a B' and label it EFGH.

Answer explanation

You should have the quadrilateral moved over from point B to B'.

Triangle ABC is a right triangle. Angle A measures 28 degrees. what are the other two angle measurements?

• 28, 68

• 45, 45

• 62, 95

• 62, 90

Answer explanation

90+28+x=180

118+x=180

x=62

Which sequence of transformation best fits this image

• there is no sequence of transformation

• reflect and translate up and to the left

• Dilation pt. I

  scale factor 1/4 - 1/5

  Reflect

  translate up and to the left

• dilation from pt. k

  scale factor 1/2

  translate

Explain how these two shapes are similar

• They have the same angles - but not the same scale factor which makes them similar

• They have equal scale factors - which makes them similar

• they are not similar because they are not the same shape.

• They have the same angles and an equal scale factor.

Draw two polygons that could be similar but mistaken for being not similar

Answer explanation

Your shapes should be different shapes - but have either equal angle measurements or equal scale factors.