Open Up - Grade 8 - Mathematics - Unit 2 - Lesson 1

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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7.G.1

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?

• Yes, they are scaled copies.
• No, they are not scaled copies.

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7.G.1

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 B a scaled copy of Rectangle A?

• Yes, they are scaled copies.
• No, they are not scaled copies.

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7.G.1

Rectangle A has length 12 and width 8. Rectangle B has length 15 and width 10. Rectangle C has length 30 and width 15.Explain how you know that Rectangle C is not a scaled copy of Rectangle B.

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7.G.1

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 C?

• Yes, they are scaled copies.
• No, they are not scaled copies.

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7.G.1

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

• 40, 50, 60
• 50, 60, 70
• 60, 70, 80
• 70, 80, 90

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7.G.1