A solid metallic rectangular block of dimensions 112 cm × 44 cm × 25 cm is melted and recast into a cylinder of radius 35 cm. The curved surface area (in cm2) of the cylinder is: (Take π=22/7)
Options
a) 7260
b) 6600
c) 7040
d) 6160
Solutions
As per questions
Volume of cuboid =
Volume of cylinder =
Curved surface area of the cylinder =
L = 112
B = 44
H = 25
R = 35
H = ?
H = 112 x 44 x 25 =
H = 112 x 44 x 25 x 7 = 22 x 35 x 35
H = 32
Curved surface area of the cylinder =
=
= 44 x 160
= 7040
Ans: c) 7040