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If D,E and F are the middle points of th...

If D,E and F are the middle points of the sides BC,CA and AB of the `DeltaABC`, then AD+BE+CF is

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(i) `AD+BE+CF==(d-a)+(e-b)+(f-c)`
`=(d+e+f)-(a+b+c)=0` [usingg eq. (i)]
`implies AD+BE+CF=0`
(ii) Here, `OE+OF+OD=e+f-d`
`=(c+a)/(2)+(a+b)/(2)-(b+c)/(2)=a=OA`
`therefore OE+OF+OD=OA`
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