The number of square units needed to fill up a region on a flat surface.

The intersection of a three-dimensional solid and a plane.

In three dimensions, a line segment formed by the intersection of two faces of a polyhedron.

The set of numbers that cannot be expressed in the form a/b , where a and b are integers and b ≠ 0 .

A two-dimensional closed figure of three or more line segments (sides) connected end to end. Each segment is a side and only intersects the endpoints of its two adjacent sides. Each point of intersection is a vertex.

A three-dimensional figure with a base that is a polygon. The lateral faces are formed by connecting each vertex of the base to a single point that is above or below the surface that contains the base.

A point where two or more line segments or rays meet to form a “corner,” such as in a polygon or angle. A point where the edges of the solid meet.

The surface a solid object stands on, or the bottom line of a shape such as a triangle or rectangle.

One of the flat surfaces of a polyhedron, including the base(s).

A (flat) side of a polyhedron. It is always a polygon.

A three-dimensional figure with no holes for which all faces are polygons.

right rectangular prism

A solid figure in which all six faces are rectangles.

A measurement of the size of the three-dimensional region enclosed within an object.

The perimeter (distance around) of a circle.

A line segment drawn through the center of a circle with both endpoints on the circle.

An indication of the size or magnitude of a geometric figure. For example, the length of a line segment, area and perimeter of a triangle, degrees of rotation, etc.

The ratio of the circumference (C) of the circle to its diameter (d). For every circle, π = circumference/diameter = C/d . Numbers such as 3.14, 3.14159, or 22/7 are approximations of π.

The sum of all the area(s) of the surface(s) of a three-dimensional solid. For example, the surface area of a prism is the sum of the areas of its top and bottom bases, and its vertical surfaces (lateral faces).

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CC2 Chapter 9

Question	Answer
area	The number of square units needed to fill up a region on a flat surface.
cross section	The intersection of a three-dimensional solid and a plane.
edge	In three dimensions, a line segment formed by the intersection of two faces of a polyhedron.
irrational number	The set of numbers that cannot be expressed in the form a/b , where a and b are integers and b ≠ 0 .
polygon	A two-dimensional closed figure of three or more line segments (sides) connected end to end. Each segment is a side and only intersects the endpoints of its two adjacent sides. Each point of intersection is a vertex.
pyramid	A three-dimensional figure with a base that is a polygon. The lateral faces are formed by connecting each vertex of the base to a single point that is above or below the surface that contains the base.
vertex	A point where two or more line segments or rays meet to form a “corner,” such as in a polygon or angle. A point where the edges of the solid meet.
base	The surface a solid object stands on, or the bottom line of a shape such as a triangle or rectangle.
degree	A unit for measuring angles.
face	One of the flat surfaces of a polyhedron, including the base(s).
lateral face	A (flat) side of a polyhedron. It is always a polygon.
polyhedron	A three-dimensional figure with no holes for which all faces are polygons.
right rectangular prism	A solid figure in which all six faces are rectangles.
volume	A measurement of the size of the three-dimensional region enclosed within an object.
circumference	The perimeter (distance around) of a circle.
diameter	A line segment drawn through the center of a circle with both endpoints on the circle.
inference	A statistical prediction.
measurement	An indication of the size or magnitude of a geometric figure. For example, the length of a line segment, area and perimeter of a triangle, degrees of rotation, etc.
pi	The ratio of the circumference (C) of the circle to its diameter (d). For every circle, π = circumference/diameter = C/d . Numbers such as 3.14, 3.14159, or 22/7 are approximations of π.
surface area	The sum of all the area(s) of the surface(s) of a three-dimensional solid. For example, the surface area of a prism is the sum of the areas of its top and bottom bases, and its vertical surfaces (lateral faces).

Created by: Kish-Rosciszewski

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