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Question Number 11373 by ketto last updated on 22/Mar/17

Answered by sm3l2996 last updated on 22/Mar/17

$$\stackrel{-}{\mathrm{D}}\overrightarrow{\mathrm{F}}=\mathrm{D}\overrightarrow{\mathrm{A}}+\mathrm{A}\overrightarrow{\mathrm{B}}+\mathrm{B}\overrightarrow{\mathrm{F}}$$$$\mathrm{DF}=\sqrt{{\mathrm{DA}}^2+{\mathrm{AB}}^2+{\mathrm{BF}}^2}$$$$\mathrm{DF}=\sqrt{8^2+{10}^2+6^2}=\sqrt{200}$$$$\mathrm{DF}=10\sqrt{2}$$

Commented by sm3l2996 last updated on 22/Mar/17

$$\mathrm{DF}=10\sqrt{2}\mathrm{cm}$$

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