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TOTAL SURFACE AREA OF A CONE = (CURVED SURFACE AREA+AREA OF CIRLAR BASE)

IN THE FORMALS
TOTAL SURFACE AREA :- pi*R*(L+R)
L^2 = (L+R)
then why "pi" should be keep in the formula

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HR Interview Other Question

ANY REASONING PUZZLE I WANT IT Two persons are walking into a railway tunnel. Upon crossing 2/3rd of the tunnel, they saw train is coming from opposite direction. Each person ran for a different end of tunnel with speed of 10 km per hour. Fortunately, both persons escaped from the tunnel just right time i.e.. at the time train would have run through them. Assuming train was running with a constant speed and both persons reacted immediately, Find out speed of train.