In a triangle ABC, if $|\overrightarrow {BC} | = 8,|\overrightarrow {CA} | = 7,|\overrightarrow {AB} | = 10$, then the projection of the vector $\overrightarrow {AB} $ on $\overrightarrow {AC} $ is equal to :
${{25} \over 4}$
${{127} \over 20}$
${{85} \over 14}$
${{115} \over 16}$
Solution
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