Question: Which of the figures is an obtuse triangle?

A ) Figure 4
B ) Figure 3
C ) Figure 2
D ) Figure 1

Steps to derive

1 Figures 1 and 3 are acute triangles.
 [All the angles are less than 90^o.]

2 Figure 2 is a right triangle.
 [One angle is 90^o.]

3 Figure 4 is an obtuse triangle.
 [One angle is greater than 90^o.]



Hence the right answer is Option A

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