1/24/20 Practice

Two objects that are the same shape but not the same size are _______.

• Congruent
• Vertical
• Similar
• Complementary 

Tags

CCSS.HSG.SRT.A.2

CCSS.HSG.SRT.A.3

CCSS.HSG.SRT.B.5

If the scale factor is greater than one, the new figure will be

• a reduction
• an enlargement
• a scale
• not proportional

Tags

CCSS.8.G.A.3

CCSS.8.G.A.4

Rectangle ABCD is similar to rectangle A’B’C’D’.

If the perimeter of rectangle ABCD is 18 units and it is dilated by a scale factor of 2, what is the perimeter of rectangle A’B’C’D’?

• 10 units

• 28 units

• 18 units

• 36 units

Rectangle ABCD is similar to rectangle A’B’C’D’. Each dimension of rectangle ABCD is 4.3 times the corresponding dimension of rectangle A’B’C’D’. Which of the following statements is true?

• The area of rectangle A’B’C’D’ is 8.6 times the area of rectangle ABCD.

• The perimeter of rectangle A’B’C’D’ is 8.6 times the perimeter of rectangle ABCD.

• The area of rectangle A’B’C’D’ is 18.49 times the area of rectangle ABCD.

• The perimeter of rectangle A’B’C’D’ is 18.49 times the perimeter of rectangle ABCD.

If the side lengths of the square below are tripled, what is NOT true about its perimeter and area?

• The scale factor from the pre-image to the image is 3.

• The image’s perimeter will be three times larger and the area will be 9 times larger than the pre-image.

• The image’s perimeter will be 72 mm and the area will be 324 mm.

• The image’s perimeter and area will be three times larger than the pre-image.

Rectangle DEFG is similar to rectangle D’E’F’G’.

If the pre-image area of rectangle DEFG is 80 units and it is dilated by a scale factor of ½, what is true about the image’s perimeter?

• The image’s perimeter is twice as large as the pre-image’s perimeter.

• The image’s perimeter is half as large as the pre-image’s perimeter.

• The image’s perimeter is ¼ as large as the pre-image’s perimeter.

• Cannot be determined.

A 24 x 32 inch photograph is reduced so that each side is one-fourth the original size. What is the number of square inches in the smaller photograph and the new perimeter length?

• 48 cm² / 28 cm

• 28 cm² / 48 cm

• 6 cm² / 8 cm

• 768 cm² / 112 cm

The sides’ measures of two squares are shown below. The area of the smaller square is 81 square feet. What is the area of the larger square?

• 9 cm²

• 27 cm²

• 384 cm²

• 729 cm²

Sides a and b are called legs.

• True

• False

Side c on a right triangle is ALWAYS the longest.

• True

• False