Question

let ABC be a triangle and let DE be the midpoints of sides AB,BC respictively then BC+DC​

Answer 1

Step-by-step explanation:

You have to solve it using vector mathematics. Let O be the intersection point of BE and DC. OA = a vector

OB = b vector

OC = c vector

OD= (a+b)/2

OE = (a+c)/2

BE = OE - OB ...solve it

DC = OC - OD .... solve it

BE+DE = 3/2 * (c-b)

BC= c-b

Therefore, BE+DC = 3/2* BC...

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