Question

answer it immediately ​

Answer 1

Given that volume of the frustum(V) = 12308.8cm (cube) 

Also radii of the top (r1) = 12 cm 

Radii of the bottom (r2) = 20 cm 

We know that  

Volume of frustum 

Also we know that  

Lsquare  + h square + (r1-r2) whole square 

===> lsquare = 225 + 64 

Lsquare= 289 

L=17cm 

Now the bucket will be open at the top and so the area of the metal sheet used in making the bucket (Say A)  

A= lateral  surface of the frustum + (area of circle at the bottom with r2 = 20cm) 

A= pi(r1+r2)l +pi r square 

= 3.14x(12+20) x 17 + 3.14x (20) square 

= 3.14x32x17 + 3.14x400 

= 1708.16 + 1256 

= 2964.16 cm square

==========================================================

Hope it helps!