_Helopulation of a city was 2,46,978 in the years2010 in the year 2012, it was found to be increased by 259560. what was the populationof the city in 2021?

Answers (1)

Proof: We have,

\ angle A+angle B+angle C=180^circ\ \Rightarrow angle B+angle C=180^circ-angle A\ \Rightarrow (B+C)/2=90^circ-A/2

Taking sin both side we get ,

\ sin(B+C/2)=sin(90^circ-A/2)\ \Rightarrow sin(B+C/2)=cosA/2

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