That's called the figure's area.That's called the figure's area.That's called the figure's area.That's called the figure's area.
It depends on the type of figure. If it is a 2D figure, then it is called area. If it is a 3D figure, then it is called volume.
An eight sided figure is called an octagon.
A 3-sided figure is called a triangle.
A four sided figure is called a quadrilateral.
A 12-sided figure is called a dodecagon.
A seven sided figure is called a heptagon.
A side of a solid figure is called a face.
The original figure is called the pre-image. After the transformation it becomes the image.
The distance around a figure is called the "perimeter", unless the figure is a circle - in that case, it is called the "circumference".
That's called a closed figure.That's called a closed figure.That's called a closed figure.That's called a closed figure.
A six-sided plane figure is called a hexagon.