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Question

Find the coordinates of the points which divide the line segment joining A(-2, 2) and B(2, 8) into four equal parts.


A

, (0,5) ,

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B

(-1,7), (0,5) , (1, 13)

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C

, (0,5) ,

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D

, (0,5) ,

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Solution

The correct option is A

, (0,5) ,


Let P,Q and R be the points which divides the line segment into four equal parts. P divides the line segment AB internally in the ratio of 1:3

Coordinates of point P(x1,y1)

x1=1.(+2)+3(2)3+1=6+24=1

y1=1.(8)+3(2)3+1=144=72

p(x1,y1)=(1,72)

Q divides the line segment in the ratio of 2:2 or 1:1

Q is the midpoint of line segment AB

Q(x2,y2)

Q (2+22,2+82)= Q(0, 5)

Coordinates of Q are(0, 5)

R divides the line segment AB internally in the ratio of 3:1

R(x3,y3)

x3 = = 1

y3=3(8)+1(2)1+3=264=132

Coordinates of R(x3,y3) = (1,132)

Coordinates of P,Q,R are (1,72), (0,5) , (1,132) respectively.


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