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

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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.

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.

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.

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.

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.

Here are three polygons.
Draw a scaled copy of Polygon A with scale factor \frac{1}{2} .
Draw a scaled copy of Polygon A with scale factor 2.
Draw a scaled copy of Polygon A with scale factor \frac{1}{4}.

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

50, 60, 70

70, 80, 90

60, 70, 80

40, 50, 60

In the picture lines AB and CD are parallel. Find the measures of the following angles.
(Only one measurement per angle)

45 degrees
160 degrees
142 degrees
38 degrees
145 degrees
34 degrees

Angle BCD
Angle ECF
Angle DCF

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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

80 cm by 20 cm

10 cm by 2 cm

18 cm by 4.5 cm

13 cm by 4 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.

Is Rectangle A a scaled copy of Rectangle B?

Yes, they are scaled copies.

No, they are not scaled copies.

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.

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.

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

50, 60, 70

70, 80, 90

60, 70, 80

40, 50, 60

In the picture lines AB and CD are parallel. Find the measures of the following angles.
(Only one measurement per angle)

45 degrees

160 degrees

142 degrees

38 degrees

145 degrees

34 degrees

Angle BCD

Angle ECF

Angle DCF

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

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

Here are three polygons.Draw a scaled copy of Polygon A with scale factor \frac{1}{2} .Draw a scaled copy of Polygon A with scale factor 2.Draw a scaled copy of Polygon A with scale factor \frac{1}{4}.

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.

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?

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?

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.

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?

Here are three polygons.Draw a scaled copy of Polygon A with scale factor \frac{1}{2} .Draw a scaled copy of Polygon A with scale factor 2.Draw a scaled copy of Polygon A with scale factor \frac{1}{4}.

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

In the picture lines AB and CD are parallel. Find the measures of the following angles.(Only one measurement per angle)

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.

Here are three polygons.
Draw a scaled copy of Polygon A with scale factor \frac{1}{2} .
Draw a scaled copy of Polygon A with scale factor 2.
Draw a scaled copy of Polygon A with scale factor \frac{1}{4}.

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.

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?

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?

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.

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?

Here are three polygons.
Draw a scaled copy of Polygon A with scale factor \frac{1}{2} .
Draw a scaled copy of Polygon A with scale factor 2.
Draw a scaled copy of Polygon A with scale factor \frac{1}{4}.

In the picture lines AB and CD are parallel. Find the measures of the following angles.
(Only one measurement per angle)