#### Multiple Choice Question (MCQ)

In the triangle ACE , AE is parallel to BD , what is the approximate length of DE ?

1. ×

2.33

2. ×

2.67

3. ×

3.33

4. ×

3.67

5. ×

6.67

Collected in the board: Triangle

Steven Zheng posted 2 months ago

1. Since the triangle BDC is similar to triangle AEC , their corresponding sides are proportional,

\dfrac{BD}{AE} = \dfrac{DC}{EC}

\dfrac{3}{5}=\dfrac{4}{EC}

\therefore EC = \dfrac{5}{3}\cdotp 4 \approx6.67

DE = EC-DC = 6.67-4=2.67

Steven Zheng posted 2 months ago

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