MathematicsIn ΔABC,DE∥BC,AE=1.8cm, EC=5.4cm,BD=7.2cm , then AD=

In $Δ A B C, D E ∥ B C, A E = 1.8 cm,$ $E C = 5.4 cm, B D = 7.2 cm$ , then $A D =$

A
4.2 cm
B
3.9 cm
C
2.4 cm
D
1.3 cm

Solution:

By BPT

$\frac{A E}{E C} = \frac{A D}{B D}$

$\Rightarrow \frac{1.8}{5.4} = \frac{A D}{7.2}$

$\Rightarrow A D = 2.4 cm$

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