Question

A cylindrical box is closed at both ends .if it's base diameter is 7cm and height 8cm find its total surface area​

Answer 1

Answer:

= 253 cm square

Step-by-step explanation:

Radius of cylindrical box = diameter / 2

= 7/2 cm

= 3.5 cm

Total surface area of box = 2 pi r ( r + h )

= 2*22/7*3.5 ( 3.5 +8 ) cm square

= 2*22*0.5*11.5 cm square

= 253 cm square

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Answer 2

Answer:

given:

h = 8cm

d=7

r=7/2

$tsa = 2\pi \: r \: (h + r)$

= 2 x 22/7 x 7/2 ( 8 + 7/2 )

= 2x 22/7 x 7/2 ( 16+7 /2)

= 2 x 22/7 x 7/2 (23/2)

= 44 /7x 7/2 x 11.5

= 6.28 x3.5x 11.5

= 252.7

hope it helps u mate!!!!