Question

30 circular plates each of radius 14 cm nd thickness 3 cm are placed one above the other to form a cylinder. Find the lateral surface area​

Answer 1

Answer:

9152 cm

Step-by-step explanation:

Given, radius 14 cm, thickness =3 cm, number of plates =30

Therefore, height of cylinder will be 3×30=90 cm

We know, total surface area of cylinder =2πr(r+h) cm

2

Therefore, total surface area =2π(14)(14+(90))=9152 cm

Answer 2

Answer:

LSA of one plate=2πrh

=2x22/7x14x3

=264 cm²

Therefore LSA of 30 plates=264x30

=7920 cm²