Find(i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is4.2 m in diameter and 4.5 m high.(ii) how much steel was actually used, if `1/(12)` of the steel actually used was wasted in making the tank

Explanation

To solve the problem step by step, let's break it down into two parts as given in the question.

### Part (i): Finding the Lateral or Curved Surface Area of the Cylinder

1. **Identify the dimensions of the cylinder**:
- Diameter = 4.2 m
- Height = 4.5 m

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