Solids Review Day Warm Up

If a rectangle has an area of 48 cm², what would be the area of   a similar rectangle if the dimensions are doubled?

• 96 cm²
• 192 cm²
• 216 cm²
• 2304 cm²

What happens to the perimeter of a square if the sides are    halved?

• doubles
• halved
• quadrupled
• forthed

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

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

A cube has a surface area of 100 cm².  The linear scale factor is 1.2, what is the new SA?

• 144 cm²
• 83.3 cm²
• 120 cm²
• 101.2 cm²

A triangle's 3 sides are increased by a scale factor of 3/4.  What is the result on the area of the new figure?

• The are is increased by 3/4.
• The area is increased by 4/3.
• The area is decreased by 9/16.
• Not enough information.

When multiplying by a scale factor the area will multiply by...

• The same scale factor
• The scale factor doubled
• The scale factor squared (to the power of 2)

When multiplying by a scale factor the perimeter will multiply by...

• The same scale factor
• The scale factor doubled
• The scale factor squared (to the power of 2)

If the ratio of the sides of two rectangles is 3:4, what is the ratio of their perimeters ?

• 3:4
• 9:16
• 6:8
• 9:8

If the ratio of the radii of two circles is 3:4, what is the ratio of their areas ?

• 3:4  
• 6:8
• 9:16
• 27:64