# Octagonal mat

Octagonal mat formed from a square plate with a side of 40 cm so that every corner cut the isosceles triangle with leg 3.6 cm. What is the area of one mat?

## Correct answer:

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Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

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