# Regular octagon pad

You need to make a pad in the shape of a regular octagon with a side length of 4 cm. What is the minimum diameter of the circle-shaped semi-finished product from which we make the pad, and what will be the percentage of waste? (Round the results to 1 decimal place)

**Your answer:**Tips to related online calculators

Our percentage calculator will help you quickly calculate various typical tasks with percentages.

Do you want to round the number?

See also our right triangle calculator.

See also our trigonometric triangle calculator.

Do you want to round the number?

See also our right triangle calculator.

See also our trigonometric triangle calculator.

#### You need to know the following knowledge to solve this word math problem:

We encourage you to watch this tutorial video on this math problem: video1