Q. 54.1( 179 Votes )

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Answer :

Let the vertices of the triangle be A (4, - 6), B (3, - 2), and C (5, 2)

Let D be the mid-point of side BC of ΔABC Therefore, AD is the median in ΔABC

To prove: Area ΔABC = Area ΔABD + Area ΔADC




Midpoint of the line joining the points A(x1, y1) and B(x2, y2) is given by



Therefore, by applying the formula we can get the coordinate of D

Coordinates of point D = () = (4, 0)


We also know that if A(x1, y1), B(x2, y2) and C(x3, y3) are vertices of a triangle then


Area of triangle is given by,



For A (4, - 6), B (3, - 2), and C (5, 2)

Area of the Δ (ABC) = = [4 (-2 - 2) + 3 (0+ 8) + 5 (-6+ 2)]


    = (-16 + 24 – 20)


= - 6 Square units


However, area cannot be negative. Therefore, area of ΔABC is 6 square units


Now for A(4, -6), D(4, 0), C(5, 2)

Area of the Δ (ADC) = = [4 (0 - 2) + 4 (2 + 6) + 5 (-6 - 0)]


= (-8 + 32 – 30)


= - 3 Square units


However, area cannot be negative. Therefore, area of ΔADC is 3 square units

Now for for A(4, -6), B(3, -2) and D(4, 0)

Area of Δ ABD =  [4(-2 - 0) + 3(0 + 6) + 4(-6 +2)]

Area = [-8 + 18 - 16]

Area = -3 square units

Now the Area cannot be negative so Area of ΔABD = 3 units

Area of Δ ABD + Area of Δ ADC = 3 + 3 square units

Area of Δ ABD + Area of Δ ADC = 6 = Area of Δ ABC


Clearly, median AD has divided ΔABC in two triangles of equal areas

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