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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 | |