Question

if the points -1,2 0,P and 2,5 are collinear then value of P is

Answer 1

Answer:





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>>Area of Triangles using Determinants

>>If the points A(1, 2) , O (...

Question



If the points A(1,2), O(0,0) and C(a,b) are collinear then 

A

a=b

B

a=2b

C

2a=b

D

a=−b

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Solution



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Correct option is

C

2a=b

Since the given points are collinear, they do not form a triangle, which means

area of the triangle is Zero.

Area of a triangle with vertices (x1,y1) ; (x2,y2)  and (x3,y3)  is ∣∣∣∣∣2x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣∣∣∣∣