Question

1) If the curved surface area of a right circular cylinder of height 21 cm is 132 cm2, then find the diameter of the base of the cylinder.
2) A cylindrical pillar is 50 cm is diameter and 3.5m in h...

Answer 1

1) CSA = 2πrh
132 = 2×22÷7×r×21
r= 1 cm
diameter = 2cm

Answer 2

Answer 1)

curved surface area of a cylinder= 2πrh

height = 21cm

so

132=2πrh

$132 = 2\pi \times r \times 21$

$\frac{132}{42} = \pi \times r$

$3.14 \times \frac{7}{22} = r$

r= 1


diameter = 2 radius

diameter= 2

2) plz provide all data what you want to know in 2nd