1.

If M(4, 5) is a mid point of line segment AB and co-ordinate of A is (3, 4), then find the co-ordinate of point B.

Answer»

Let co-ordinate of B is (x, y)

Given : co-ordinate of mid point of (3, 4) and (x, y)

4 = (3 + x)/2 

⇒ 3 + x = 8

⇒ x = 8 – 3 = 5

and 5 = (y + 4)/2

⇒ y + 4 = 10

⇒ y = 10 – 4 = 6

Hence, co-ordinate of B = (5, 6)



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