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A+B+C=180
A+C=2B
B=.... ?

B=60

Yes..)

but i did nt get u..)

from sine rule, c/a =... ?
then c/a *(2sin A cos A )= .. ?

Ha...Silly...i got it..:)

wasn't it easy ? ;)

what means AP ?

Arithmetic Progression
if, a,b,c are in AP, then
2b=a+c

how did u come up with sides 3x, 4x, 5x ?
and angels are in AP, not sides....

OPSS... i look ur coment before hartnn :)