A) 1 right angle
B) 2 right angles
C) 3 right angle
D) 4 right angles
Correct Answer: D
Solution :
\[\angle a=\angle 1+\angle 2\] [exterior angle property] \[\angle b=\angle 3+\angle 1\] \[\angle c=\angle 3+\angle 2\] \[\angle a+\angle b+\angle c=2(\angle 1+\angle 2+\angle 3)\] \[=2(180{}^\circ )=360{}^\circ \] \[\angle a=\angle b+\angle c=4\times 90{}^\circ \] (Sum of angles of a triangles is\[180{}^\circ \])
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