Q. 29

# If the coordinate

Answer :

Let the midpoint of AB be M(x, y)

Using Section formula:

M(x, y) = M(x, y) = (4 , 1)

Slope of line AB(m1) = m1 = -3

From the perpendicularity relationship we know m1 × m2 = -1

Slope of line PM(m2) = …Equation(i)

Slope of line PM(m2) from Two-point formula = …Equation(ii)

Equating equation (i) & (ii) 12 = 4-x

x = -8

P(-8, 5)

Length AB = Length AB = 2√10 units

Length PM = Length PM = 4√10 units

Area of ∆PAB = 0.5 × 2√10 × 4√10

Answer: Area of the triangle is 40 sq. units

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