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Question

If A (–2, –1), B (a, 0), C (4, b) and D (1, 2) are the vertices of a parallelogram. Find the values of a and b. [3 MARKS]


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Solution

Formula: 1 Mark
Application: 1 Mark
Answers: 1 Mark

We know that the diagonals of a parallelogram bisect each other.

The coordinates of the mid-point of AC = The coordinates of the mid-point of BD i.e.

If A(x1,y1),B(x2,y2),C(x3,y3) and D(x4,y4) are the vertices of parallelogram ABCD, Then

x1+x32,y1+y32=x2+x42,y2+y42

(2+42,1+b2)=(a+12,0+22)

(1,b12)=(a+12,1)

a+12=1 and b12=1

a+1=2 and b1=2

a=1 and b=3


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