In the seating arrangement of desks in a classroom three students Rohini, Sandhya and Bina are seated at A (3, 1), B (6, 4) and C (8, 6). Do you think they are seated in a line?
Points are A (3, 1), B (6, 4) and C (8, 6)
For sitting in a line three points must be collinear i.e AB + BC = AC
Length of side AB =
Length of side AB =
= 
= 
= 
units
Length of side BC =
= 
= 
= 
units
Length of side AC =
= 
= 
units
AB + BC = AC
+ 
= 
The points are collinear.
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