Scale Factor

Scale Factor

Let's Review!!!​

Multiple Choice

what is the area of this semicircle ?
d = 8 cm 

• 100.48 cm²
• 80 cm²
• 200.96 cm²
• 25.12 cm²

Multiple Choice

• 122.46 mi²
• 122. 45 mi²
• 175.84 mi²
• 175.85 mi²

Multiple Choice

The diagram below shows the dimensions of Mrs. Prothro’s new swimming pool. A cover is needed for the pool, what will be the approximate area of the cover?

• 720 ft²

• 580.92 ft²

• 592.83 ft²

• 238.5 ft²

Multiple Choice

What is the area of the composite figure? (use 3.14 for pi)

• 14 cm²
• 6.28 cm²
• 12.56 cm²
• 20.28 cm²

Multiple Choice

Find the area of the composite figure. Use 3.14 for Pi.

• 153.93 in2

• 115.43 in2

• 230.86 in2

Scale Factor

Similar figures are created by multiplying every side length of an ORIGINAL image by a scale factor (multiplier) to create a COPY image.​

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Scale factor= copy/original

Fill in the Blanks

#1 Find the scale factor of each and label the scales as either an enlargement or reduction:

Fill in the Blanks

#2 Find the scale factor of each and label the scales as either an enlargement or reduction:

Fill in the Blanks

#3 Find the scale factor of each and label the scales as either an enlargement or reduction:

Multiple Choice

What is the formula for scale factor?

• $$\frac{new}{old}$$

• $$\frac{old}{new}$$

Multiple Choice

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

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

Multiple Choice

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

• an enlargement
• a reduction
• a scale factor
• bigger

Multiple Choice

What is the scale factor from the small shape to the big shape?

• 1/2
• 7/3
• 2
• 10/3