Grade 8 | Unit 2 | Lesson 1: Projecting and Scaling | Practice Problems

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.

• 6 cm by 1.5 cm

• 10 cm by 2 cm

• 13 cm by 4 cm

• 18 cm by 4.5 cm

• 80 cm by 20 cm

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CCSS.7.G.A.1

CCSS.7.RP.A.2

Rectangle A has length 12 and width 8. Rectangle B has length 15 and width 10. Rectangle C has length 30 and width 15. Is Rectangle A a scaled copy of Rectangle B? If so, what is the scale factor?

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CCSS.7.G.A.1

CCSS.7.RP.A.2

Is Rectangle B a scaled copy of Rectangle A? If so, what is the scale factor?

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CCSS.7.G.A.1

CCSS.7.RP.A.2

Explain how you know that Rectangle C is not a scaled copy of Rectangle B.

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CCSS.7.G.A.1

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Is Rectangle A a scaled copy of Rectangle C? If so, what is the scale factor?

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CCSS.7.G.A.1

CCSS.7.RP.A.2

Here are three polygons. Draw a scaled copy of Polygon A with scale factor 1/2. Draw a scaled copy of Polygon B with scale factor 2. Draw a scaled copy of Polygon C with scale factor 1/4.

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CCSS.7.G.A.1

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

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CCSS.7.G.A.2

In the picture lines AB and CD are parallel. Find the measures of the following angles. Explain your reasoning. Description: Three lines in a plane. Line A B. Line B F. Line D E. Lines B F and A B intersect at the point B. Lines B F and D E intersect at point C. Line D E is above line A B. Angle A B F is labeled 38 degrees. Angle BCD Angle ECF Angle DCF

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CCSS.7.G.B.5