1.

If in a right-angled triangle ABC, hypotenuse AC = p, then what is \(\overrightarrow {AB} \cdot \overrightarrow {AC} + \overrightarrow {BC} \; \cdot \overrightarrow {BA} + \overrightarrow {CA} \cdot \overrightarrow {CB} \) equal to?

A. p2
B. 2p2
C. \(\frac{{{p^2}}}{2}\)
D. p
Answer» B. 2p2


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