Laika notices a right angled triangle and observes that one acute angle is half the size of the other one. In this case, the smallest angle would be:-
Let the angles of the triangle be $$\theta,2\theta,90^\circ$$
=> Sum of angles = $$\theta+2\theta+90^\circ=180^\circ$$
=> $$\theta=\frac{90^\circ}{3}=30^\circ$$
=> Ans - (A)
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