OpenUp 8th Math 2.1 Review

Rectangle A measures 12cm by 3cm. Rectangle B is 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 4cm

• 18 cm by 4.5 cm

• 80 cm by 20 cm

Rectangle A has a length of 12 and width of 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

• no

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

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

• 4/5

• 5/4

• 12/15

• 8/10

Rectangle A has a length of 12 and width of 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

• no

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

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

• 4/5

• 5/4

• 12/15

• 8/10

Rectangle A has a length of 12 and width of 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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Rectangle A has a length of 12 and width of 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

• no

Which of the following would be a scaled copy of Polygon A with a scale factor of 1/2?

• A right triangle with each side half as long as the original

• A quadrilateral with each side twice as long as the original

• A right triangle with each side twice as long as the original

• A right triangle that is enlarged by 200%

Which of the following would be a scaled copy of Polygon B with a scale factor of 2?

• A quadrilateral with side half as long as the original

• A quadrilateral with each side twice as long as the original

• A right triangle with each side twice as long as the original

• A quadrilateral that is shrunken by 50%

Which of the following would be a scaled copy of Polygon C with a scale factor of 1/4?

• A quadrilateral with side half as long as the original

• A parallelogram with each side 1/4 as long as the original

• A parallelogram with each side 4 times as long as the original

• A quadrilateral that is shrunken by 50%