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###### Aditi Agrawal posted an Question
May 28, 2020 • 22:12 pm 30 points
• IIT JAM
• Physics (PH)

# Oa +ob+oc +od =4 o1 illustration(6 )if a, b, c, d be any four points and e and f be the middle points of ac and bd respectively, then the solut ab+cb+cd + ad is

OA +OB+OC +OD =4 O1 ILLUSTRATION(6 )If A, B, C, D be any four points and E and F be the middle points of AC and BD respectively, then the SOLUT AB+CB+CD + AD is equal to (a) 3 EF (b) 4 EF (c) 4 FE (d) 3 FE

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• ##### Abhishek singh

Here is the solution for second part. Patiently read the solution. if you got stuck anywhere do repeat the solution. Match each step of solution to the wordings of question. I have made some extra lines to show you the calculations. A,B,C,D,E,F all points are shown. Use the property of parallelogram. I had taken AB parallel to DC for simplification. Best regards.

can you please explain the section formula for vectors with it's applications

https://www.toppr.com/guides/maths/vector-algebra/section-formula/

it*

thanks

• ##### Abhishek singh

here is the solution. To prove this type of questions, you should take S, such that the expression simplifies. you would be able to save time. I did use some properties of centroid. You should remember these properties. make note of them. Best regards.