Basic geometry proof

• Sep 5th 2011, 07:10 AM
MichaelLight
Basic geometry proof
Given a triangle ABC and D is the midpoint of BC. Prove that

• Sep 5th 2011, 07:35 AM
Plato
Re: Basic geometry proof
Quote:

Originally Posted by MichaelLight
Given a triangle ABC and D is the midpoint of BC. Prove that
$\overrightarrow {DA} = \overrightarrow {AB} + \overrightarrow {BD} \;\& \,\overrightarrow {DA} = \overrightarrow {AC} + \overrightarrow {CD}$
Note that $\overrightarrow {BD}+\overrightarrow {CD}=0$.