Question

the curved surface area of a cyclinder is 251.2cm square. find the radius of the its height is 8cm​

Answer 1

Answer:

we have ,

curved surface area of cylinder=251.2sq.cm

height=8cm

we know that ,

curved surface area of cylinder=

$= 2\pi \: rh \\ = > 251.2 {cm}^{2} = 2 \times \frac{22}{7} \times r \times 8cm \\ = > \frac{251.2 {cm}^{2} \times 7}{2 \times 22 \times 8cm} = r \\ = > \frac{125.6cm \times 7}{22 \times 8} = r \\ = > \frac{879.2cm}{176} = r \\ = > 4.995cm = r$