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23 Cards in this Set

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  • Back

RIGHT ANGLE
This is an angle that forms a square corner.
POLYGONS
A polygon is a simple, closed figure with straight sides. The number of angles is the same as the number of sides.
SIMILAR
Figures that have the same shape but are different sizes.

A POINT

A point is an exact location in space.
ANGLE
An angle is formed by two rays that start at the same endpoint. They are measured in degrees using a protractor.The rays are the sides of the angle. The endpoint is its vertex.
SPACE FIGURES
They are three-dimensional geometric figures. they can have different numbers of flat surfaces called faces, and edges (lines), and vertices (angles).
FLIP
An imaginary line acts like a mirror for the figure. The figure is flipped like a page in a book. It can also be flipped to the left or up or down.

A LINE
A line is also a straight figure, but it has no endpoints
CONGRUENT
These are figures that are the same shape and size

INTERSECTING LINES
These are lines that cross each other.
TURN
Turn a figure around a point. The point acts like a pin when the figure is turned. The figure is turned around one of its corners.

LINE SEGMENT

It is a straight figure with two endpoints.
LINE OF SYMMETRY
The fold line on aplane figure is a line of symmetry.

A RAY
A ray is a straight figure. It has one endpoint. It goes on forever in just one direction.
STRAIGHT ANGLE
When two right angles are put together, they form a straight angle. It measures exactly 180 degrees.

PARALLEL LINES
These are lines in the same plane that never intersect.
ACUTE ANGLE
Less than 90 degrees
A PLANE
A plane is a flat surface that goes on and on in all directions. Shapes drawn on a plane are called plane figures. Plane figures can be open like an angle or closed like a circle or polygons
OBTUSE ANGLE
Greater than 90 degrees but less than 180 degrees.

A REGULAR POLYGON
A regular polygon has all sides the same length and all angles the same measure.

PERPENDICULAR LINES
These are intersecting lines that form right angles are called perpendicular lines
SLIDE
Geometric figures can move in special ways. You can slide a figure across a line. The figure looks the same but is in a different place on the paper.
SYMMETRIC FIGURE
A figure that can be folded so that its two parts match exactly.