Question

3. The inner diameter of a circular well is 3.5 m. It is 10 m deep. Its inner curved surface
area is:
​

Answer 1

Answer:

110m²

Step-by-step explanation:

Given:-

d= 3.5m

then, r= 3.5/2 m

and h= 10m

we know that,

CSA of cylinder= 2πrh

= 2×22/7×3.5/2×10

= 2×11×5

= 110m²

HOPE IT HELPS YOU

Answer 2

Step-by-step explanation:

diameter= 2×radius

$radius = \frac{diameter}{2} \\ \\ \frac{3.5}{2} = 1.75 \\ 1.75m = \: radius \\ \\ as \: we \: know \: well\: is \: a \: shape \: of \: cylinder \\ curved \: surface \: area \: of \: cylinder \: = 2 \: \pi \times r \times h \\ so \: \pi = \frac{22}{7} \\ radius = 1.75 \\ height = 10 \\ \\ 2× \frac{22}{7} \times 1.75 \times 10 \\ \\2× 22 \times 0.25 \times 10 \\ \\ 2×22 \times 2.5 = 110 \\ \\ inner \: curved \: surface \: area \: = 110m^{2}$