Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Let the points A : (0, a), B : (-2,0) and C : (1 ,1) form an obtuse angled triangle (obtuse angled at angle A), then the complete set of values of a is
A
(-2,1)
B
(-2,l)- 
C
(-l,2)
D
Text Solution
Verified by ExpertsThe correct answer is:
D
(-l,2)- 
(0, a) is a point that lies inside a circle whose end points of diameter are (-2,0) and (1,1), but does not lie on this diameter.
(0, a) lies inside circle (x + 2) (x - 1) + y (y - 1) = 0
(0 + 2)(0-l) + a(a-l)<0
a 2 - a - 2 < 0 
(a - 2) (a + 1) < 0
a 
(-l,2)
But 
because at 
points 
& (1,1) are collinear
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