Scale factor

What scale factor is used to get from the 2 inches to the 8.5 inches in the proportion?

• 4.25

• 21.25

• 2.5

• none of the above

How do you find the scale factor starting at the 2 in. moving right into the 8.5 in. ?

• Divide the 2 by 8.5

• Divide the 8.5 by 2

• Divide the 8.5 by 5

• Divide the 2 by 5

How do you find the actual height of tall building in feet?

• 2 x 4.25

• 5 x 4.25

• 8.5 x 5

• 2 x 8.5

What is the length of the building in feet.

• 70 ft.

• 5.7 ft

• 42 ft

• 16.5 ft

Which is the correct proportion to find the length ?

• $\frac{1}{20}=\ \frac{x}{3\ \frac{1}{2}}$

• $\frac{1}{20}\ =\ \ \frac{3\frac{1}{2}}{x}$

• $\frac{x}{20}\ =\ \frac{1}{3\ \frac{1}{2}}$

• All of the above

What is the scale factor from the large triangle to the small triangle?

• 2

• 1/2

• 0.5

• 5

What is the scale factor from the small triangle to the larger one.

• 2

• 1/2

• 0.5

• .05

What scale factor can be used to sole the proportion in the picture?

• 1/3

• 3

• 2

• 0.3

What is the scale factor from klmn to abcd?

• 0.85

• .085

• 8.5

• 1.2

What is the area of the drawing if it has a scale of 1in. = 3ft.

• $6\ in^2$

• $54\ in^2$

• $10\ in^2$

• $18\ in^2$