Concave Pentagon Calculator

Calculations at a concave pentagon. A polygon is called concave (bend inwards), when at least one of its angles has more than 180°. This special concave pentagon is made from a square, from which a isosceles, right triangle, formed by its diagonals, has been removed. The angle α has 270°.
Enter one value and choose the number of decimal places. Then click Calculate.

	Edge length of the square (a):
	Leg length of the triangle (b):
	Perimeter (p):
	Area (A):
	Round to   0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15   decimal places.

Lengths and perimeter have the same unit (e.g. meter), the area has this unit squared (e.g. square meter).

Last updated on 10/17/2023. Author: Jürgen Kummer

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