a wooden toy is in the form of a cone surmounted on a hemisphere the diameter of the base of cone is 16 cm and its height is 15 cm find the cost of painting the door at rupees 7 per 100 cm square
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Area of Toy=CSA of Cone + CSA of hemisphere
=πrl + 2πr^2
=22/7×8×17 + 2×22/7×8×8. (l^2=h^2+r^2)
=2992/7 + 2816/7
=5808/7
=829.7 cm^2
Now,
Cost of painting 100 cm sq.=7 Rs.
Cost of painting 1 cm sq. =7/100
Cost of painting 829.7 cm sq. = 829.7×7/100
=58.07 Rupees...
Thank You !
=πrl + 2πr^2
=22/7×8×17 + 2×22/7×8×8. (l^2=h^2+r^2)
=2992/7 + 2816/7
=5808/7
=829.7 cm^2
Now,
Cost of painting 100 cm sq.=7 Rs.
Cost of painting 1 cm sq. =7/100
Cost of painting 829.7 cm sq. = 829.7×7/100
=58.07 Rupees...
Thank You !
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