Comprehension

Direction: Consider the following for the next two (02) items that follow.

The coordinates of three consecutive vertices of a parallelogram ABCD are A(1, 3), B(-1, 2) and C(3, 5).

What is the equation of the diagonal BD?

This question was previously asked in
NDA 02/2021: Maths Previous Year paper (Held On 14 Nov 2021)
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  1. 2x - 3y + 2 = 0
  2. 3x - 2y + 5 = 0
  3. 2x - 3y + 8 = 0
  4. 3x - 2y - 5 = 0

Answer (Detailed Solution Below)

Option 3 : 2x - 3y + 8 = 0
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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Calculation:

Mid point of BD is same as mid point of AC

Mid point of AC =  = (2, 4)

Equation of BD 

y - 2 =  (x + 1)

⇒ y - 2 = (x + 1)

⇒ 3y - 6 = 2x + 2

⇒ 2x - 3y + 2 + 6 = 0

⇒ 2x - 3y + 8 = 0

∴ The equation of the diagonal BD is 2x - 3y + 8 = 0

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