The Mid Points Of The Sides Of A Triangle Are (1, 2), (0, –1) And (2, –1). Find The Coordinates Of The Vertices Of A Triangle With The Help Of Two Unknowns.

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Question

The mid points of the sides of a triangle are (1, 2), (0, –1) and (2, –1). Find the coordinates of the vertices of a triangle with the help of two unknowns.

Solution

Correct option is

(1, – 4), (3, 2) and (–1, 2)

 

Let D (1, 2), E(0, –1) and F(2, –1) be the mid points of BCCAand AB respectively. 

Let the coordinates of A be  then coordinates of B and C are  respectively

D is mid point of B and C.                 

  

  

  

  

Hence coordinates of AB and C are (1, – 4), (3, 2) and (–1, 2) respectively.

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