Triangle Proportionality Theorem

Triangle Proportionality Theorem & Parallel Lines and Proportional Parts

Multiple Choice

Triangle Proportionality Theorem: If

$$\overline{DE}\ \parallel\ \overline{AC}$$ , then 

• $$\frac{BD}{DA}=\frac{BE}{EC}$$  

• $$\frac{DA}{BD}=\frac{BE}{EC}$$  

• $$\frac{DE}{AC}=\frac{BD}{DA}$$  

We will do this one together.

We will do this one together.

Multiple Choice

Find x.

• 147

• 21

• 24.5

Multiple Choice

Find x.

• 11

• 55

• 275

We will do this one together.

We will do this one together.

Multiple Choice

Find x.

• 18

• 21

• 11.8

Multiple Choice

Find x.

• 45

• 9

• 5

• 15