We have r= 7m and h=6m
Surface area of building wall= 2πr.h=7*6*22/7= 132 m²
As the vertical angle is 60 degree we have slant height= dia
                                                                       s= 2r= 14
lateral surface area of cone= πrs=22*7*14/7=308 m²
Total surface area = 132+308= 440m²
Painting rate is Rs 30/m²
Total cost of painting= 440*30= Rs13200

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