a metallic toy is in the shape of a cylinder whose both ends are conical in shape diameter of circular cross-section of cylinder is 6 cm and its height is 10 cm the length of the toy is 18 cm find the cost of gold plating it @ 100 per cm square
Answers
Answered by
6
height of cylinder = 10 cm
height of two cone is (18-10) = 8 cm
assuming the two cone are identical, height of one cone is =8/2 = 4 cm
radius r of the cone is same as the cylinder i.e (6/2)=3 cm.
Area of cone = 3.1416 x r x l [ here l = (r^2 + h^2 )^1/2 = 5 ]
= 47.124 (approx)
So, area of two cones = 2 x 47.124 =94.25 (approx)
Area of cylinder = 2 x 3.1416 x r x h = 188.5 (approx)
so, total surface area of the toy = 94.5 + 188.5 =283
1 cm sq. gold plating costs 100
So, 283 cm sq. costs (100x283) = 283000
Similar questions