Lesson 1 Homework/Exit Ticket

Rectangle A measures 12 cm by 3 cm. Rectangle B is a scaled copy of Rectangle A. Select all of the measurement pairs that could be the dimensions of Rectangle B.

1. 6 cm by 1.5 cm
2. 10 cm by 2 cm
3. 13 cm by 4 cm
4. 18 cm by 4.5 cm
5. 80 cm by 20 cm

Rectangle A has length 12 and width 8. Rectangle B has length 15 and width 10. Rectangle C has length 30 and width 15.

1. Is Rectangle A a scaled copy of Rectangle B? If so, what is the scale factor?
2. Is Rectangle B a scaled copy of Rectangle A? If so, what is the scale factor?
3. Explain how you know that Rectangle C is not a scaled copy of Rectangle B.
4. Is Rectangle A a scaled copy of Rectangle C? If so, what is the scale factor?

Here are three polygons.

1. Draw a scaled copy of Polygon A with scale factor 12.
2. Draw a scaled copy of Polygon B with scale factor 2.
3. Draw a scaled copy of Polygon C with scale factor 14.

Which of these sets of angle measures could be the three angles in a triangle?

1. 40∘, 50∘, 60∘
2. 50∘, 60∘, 70∘
3. 60∘, 70∘, 80∘
4. 70∘, 80∘, 90∘

In the picture lines AB and CD are parallel. Find the measures of the following angles. Explain your reasoning.

1. ∠BCD
2. ∠ECF
3. ∠DCF