Question

a circular well has radius 3 metre. if a platform of uniform width of 1.5 m is laid around it,find the area of the platform.( take Pi= 3.14)​

Answer 1

Heyy!!

I m here to help u,

In this question the Total Surface Area of cylinder i.e 2×pi×r×h

Area of cylinder = 2×pi×r(r+h)

=2×3.14×3(3+1.5)

= 89.28

Answer 2

Step-by-step explanation:

Given that,

the radius of circular well = 3 cm

So, Area of circular well = 22/7 * r^2

Taking 22/7 = 3.14,

= 3.14* 9 cm^2

=28.26 cm^2

Since, Width of platform laid around well is 1.5 m.

so, the outer radius

= (3+1.5)cm=4.5cm

Then, the Area of outer boundary

= 22/7 * r^2

Taking 22/7 = 3.14,

= 3.14 * (4.5cm)^2

= 3.14 * 20.25 cm^2

= 63.585 cm^2

Now,

Since, Area of outer boundary of circular well is 63.585 cm^2 .

so, the area of platform

= Area of outer boundary of circular well - Area of circular well

= (63.585 - 28.26)cm^2

= 35.325 cm^2