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The top point of a shape where sides meet
Apex
Having the shape of a circle or related to a circle.
Circular
3D shapes with two identical, parallel faces, and the same cross-section all the way through
Prisms
The 2D shape formed when a 3D object is cut straight through.
Cross-section
The lines where two faces meet on a 3D shape.
Edges
A measurement of size, such as length, width, or height.
Dimension
The flat surfaces of a 3D shape.
Faces
The amount of space inside a 3D shape.
Volume
The total area of all the outside surfaces of a 3D shape.
Surface Area
The area of the base (bottom face) of a 3D shape.
Base Area
The straight vertical distance from the base to the top, measured at a right angle (90°).
Perpendicular Height
The slanted distance from the edge of the base to the apex
Slant Height
