Ratio of Similar Figures

What is a scale factor?

• Shapes that have the same shape, but not necessarily the same size.

• A ratio/number that compares the sizes of the parts of the scale drawings.

• They are sides that are in the same position in different plane figures.  

• The length of a side of a similar figure.

Solve for X.

• 2 ft

• 3 ft

• 4 ft

• 6 ft

Find the length of x

• x = 1

• x = 2

• x = 7

• x = 1/7

The following shapes are similar, the smaller one is the original shape, what is the scale factor?

• 8:12

• 3:2

• 4:8

• 6:12

Find missing side

• 5

• 7

• 9

• 11

Which side length corresponds with EF?

• ML

• LM

• OL

• EH

The rectangles are similar.

Solve for x.

Mathematical Equivalence

ON

Find the ratio (red to blue) of the perimeter.

• 11/6

• 6/11

• 121/36

• 36/121

Find the ratio (red to blue) of the area.

• 11/6

• 6/11

• 121/36

• 36/121

Find the ratio (red to blue) of the area.

• 9/14

• 14/9

• 196/81

• 81/196