Answer true or false :
Polythene and polyvinyl chloride (PVC) are thermosetting plastics.

Explanation

To determine whether the statement "Polythene and polyvinyl chloride (PVC) are thermosetting plastics" is true or false, we can follow these steps:

### Step 1: Understand the Types of Plastics
There are two main types of plastics: thermoplastics and thermosetting plastics.

- **Thermoplastics**: These plastics can be melted and reshaped multiple times. They become soft when heated and harden upon cooling. Examples include polythene and PVC.

- **Thermosetting Plastics**: These plastics, once set into a shape, cannot be remelted or reshaped. They are rigid and maintain their shape even when heated. Examples include Bakelite and melamine.
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