Is it necessary to draw histogram for drawing a frequency polygon?

The area of histogram of a data and its frequency polygon are same. Reason how.

Weekly wages of 250 workers in a factory are given in the following table. Construct the histogram and frequency polygon on the same graph for the data given.

Draw the diagrams of Algae.

Draw the diagram of hydra budding.

Draw a diagram of a prism .

Draw the diagram of Fungi.

Draw the diagram of a spinning wheel.

Draw the diagrams of Bacteria.

Draw the diagram of a solenoid.

Draw a labelled diagram of brain.