Similarity

Grade IX

Similarity

Multiple Choice

Triangle ABC and triangle DEF are similar as shown in the picture below.

The ratio of the correspondence side is ...

• $$\frac{AB}{DF}=\frac{BC}{DE}=\frac{AC}{EF}$$

• $$\frac{BC}{DF}=\frac{AB}{EF}=\frac{AC}{DE}$$

• $$\frac{AB}{DF}=\frac{BC}{EF}=\frac{AC}{DE}$$

• $$\frac{BC}{EF}=\frac{AB}{DE}=\frac{AC}{DF}$$

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Look at the following picture.

$\Delta ABC\sim\Delta ADE\$ with DE // BC.

If the length of BC = 30 cm, AE = 6 cm, EC = 12 cm, then the length of DE is ... cm

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