Question

The pillars of a temple are cylindrically shaped . Each pillar has a radius 20cm and height 10m . How much concrete is required to build 14 such pillars.

Answer 1

We need to find the volume of one pillar.
Volume of cylinder=πr^2h.
r=0.2m.
h=10m.
22/7×0.2×0.2×10= 1.26cu.m.
For 14 pillars, we multiply the volume by 14.
1.26×14=17.64cu.m.
Hope that helped you :)

Answer 2

✬ Volume = 17.6 m³ ✬

Step-by-step explanation:

Given:

• Radius of pillar is 20 cm.
• Height of pillar is 10 m.

To Find:

• How much concrete is required to build 14 pillars ?

Formula to be used:

• Volume of Cylinder = πr²h

Solution: Here, the height is in meter and the radius is in cm so we have to change it in centimeter.

➢ 1 meter = 1000 cm

∴ 10 meter = 10 x 1000 = 10000 cm

$\implies{\rm }$ Volume of each cylinder = πr²h cubic units

$\implies{\rm }$ 22/7 x (20)² x 10000 cm³

$\implies{\rm }$ 22/7 x 400 x 10000 cm³

$\implies{\rm }$ 88000000/7 cm³

$\implies{\rm }$ 8.8/7 m³ [ Since, 1000000 cm³ = 1 m³ ]

Hence, Volume of 1 pillar is 8.8/7 m³

➳ Volume of 14 pillars = 8.8/7 x 14 m³

➳ Volume of 14 pillars = 17.6 m³

So, 17.6 m³ of concrete is required for making 14 such pillars.