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A face is any of the individual flat surfaces of a solid object also known as sides (of a box, a pyramid, a dice, a rubik's cube). Many solid figures have more than one face.

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It measures how many units it would take to fill the inside of a 3-Dimensional figure or also known as the space occupied by an object. Use can see it in all 3-D figures, for example: a pool, a glass of water and a soda can.

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Is a 2-dimensional shape that can be folded to form a 3-dimensional shape or a solid. Or made when the surface of a three-dimensional figure is laid out flat showing each face of the figure. A solid may have different nets. Here is a example of the net of a dice.

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Relationship between two lines. A line is said to be perpendicular to another line if the two lines intersect at a right angle. A window is a example of perpendicular lines.

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Is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length). The image below shows some real examples of polygons:

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A tangent line is a line that touches a curve of a circle at one point. There's a tangent line example in a ball.

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Is a portion of the circumference of a circle, the distance between two points along a section of a curve. A piece a pizza can represent the arc length.

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The population density of a city, country, or state is a measure of how many people live within a given area. Usually given in in terms of square miles but can be given as city blocks.

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An angle whose sides are tangent, two lines intersecting the sides of a circle.
We can see a circumscribed angle in a ice cream cone.

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The circumference or perimeter is the distance once around the circle. The circumference of a wheel.