MIG-29: 1. Advanced multi-role fighter jet. 2. Superior speed and maneuverability (Mach 2.25). 3. Equipped with modern avionics and weapon systems.
MIG-21: 1. Early generation interceptor aircraft. 2. Limited to subsonic to transonic speeds. 3. Lesser avionics compared to modern jets.
In the adjoining figure, $\triangle CAB$ is a right triangle, right angled at A and $AD \perp BC$. Prove that $\triangle ADB \sim \triangle CDA$. Further, if $BC = 10$ cm and $CD = 2$ cm, find the length of AD. 
In the adjoining figure, TP and TQ are tangents drawn to a circle with centre O. If $\angle OPQ = 15^\circ$ and $\angle PTQ = \theta$, then find the value of $\sin 2\theta$. 