Question

the diameter of a cylinder is 28cm and height is 7cm and find their total surface area​

Answer 1

Answer:

1847.26

Step-by-step explanation:

A=2πrh+2πr2=2·π·14·7+2·π·142≈1847.25648

Answer 2

Answer:

1848 cm²

Step-by-step explanation:

Given -

The diameter of cylinder = 28 cm

Height of cylinder = 7 cm

To find -

Total Surface Area (T. S. A.) of cylinder

Solution -

Firstly we have to find out the radius of cylinder.

Radius = Diameter /2

= 28 cm/2

= 14 cm

T. S. A. of cylinder = 2πr(h+r)

= 2×22/7 × 14 (14+7) cm²

= 2×22×14/7 (21) cm²

= 2×22×2×21 cm²

= 44×2×21 cm²

= 88×21 cm²

= 1848 cm²

Hence total surface area of the cylinder = 1848 cm².

hope it helps.