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Question Number 126572 by sdfg last updated on 22/Dec/20

Answered by liberty last updated on 22/Dec/20

$$\mid \overrightarrow{a}+\overrightarrow{b}{\mid }^2=\mid \overrightarrow{a}{\mid }^2+\mid \overrightarrow{b}{\mid }^2+2\mid \overrightarrow{a}\mid \mid \overrightarrow{b}\mid \cos \alpha$$$$50=25+25+2\left(5\right)\left(5\right)\cos \alpha$$$$\cos \alpha =0\to \alpha =\frac{\pi }{2}$$

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