Diameter of the ball is 2.8 centimeters.Find the cost of nickel plating of such 5 balls @ 0.25 per cm square
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It is given that the object is a ball, so if it is a 3d object then it has to be a sphere.
Then,
T.S.A of sphere= 4 *pi* r^2
=》4×22/7×2.8/2×2.8/2
=》24.64 cm^2
Since, there are 5 balls
Then,
Cost of painting = 0.25×24.64×5
=》₹6.16×5
=》₹30.8
This should be the answer if I haven't made any mistakes. You can cross check.
Then,
T.S.A of sphere= 4 *pi* r^2
=》4×22/7×2.8/2×2.8/2
=》24.64 cm^2
Since, there are 5 balls
Then,
Cost of painting = 0.25×24.64×5
=》₹6.16×5
=》₹30.8
This should be the answer if I haven't made any mistakes. You can cross check.
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