First of all, it's called a pentagon. It's special for many reasons. A pentagon shaped building offers more support than a quadrilateral (four sided shape). Also, the US Dept. of Defense has its headquarters in the Pentagon which is the shape of a pentagon.
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the meaning of pentagon is five sided,so a pentagon is a five sided shape
An incision is a cut into an object, and pentagonal means five sided, so a pentagonal incision would be a five sided cut into an object.
Oh, dude, you're looking for a pentagon. It's like a shape with five sides in 2D, but when you add some depth to it, it becomes a pentagonal prism. So, yeah, pentagon is the name you're after.
It is five sided, but it is not a regular pentagon. So it is a pentagon.
It can look like a four-sided shape with five sides or a five-sided shape with four sides. The term is self-contradictory and so such a shape cannot exist!