a metal pipe is 77 cm long the inner diameter of the cross section is 4 cm and the outer dimension 4.8 cm find the total surface area
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radius of a inner cylinder is 2cm
radius of a outer cylinder is 2.4cm
height of a cylinder is 77cm
total surface area of a cylinder= 2π(R+r)h+(R²+r²)
= 2×22/7(2.4+2)77+((2.4)²+(2)²)
= 44/7(4.4)77+(5.76+4)
= 2129.6+9.76
= 2139.36cm²
radius of a outer cylinder is 2.4cm
height of a cylinder is 77cm
total surface area of a cylinder= 2π(R+r)h+(R²+r²)
= 2×22/7(2.4+2)77+((2.4)²+(2)²)
= 44/7(4.4)77+(5.76+4)
= 2129.6+9.76
= 2139.36cm²
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