A figure that is simple, closed, and consists of all sides being line segments.
Polygon
Rule to find the sum of the interior angle measures in any polygon
(n-2)180 where n represents the number of sides of the polygon
If all sides are equal and all angles are equal, the polygon is said to be called _____________________
Regular
Rule to find the measure of 1 interior angle of any regular polygon
(n-2)180/n
a 3-sided polygon
triangle
a 4-sided polygon
quadrilateral
5-sided polygon
pentagon
6-sided polygon
hexagon
7-sided polygon
heptagon
8-sided polygon
octagon
9-sided polygon
nonagon
10-sided polygon
decagon
11-sided polygon
undecagon
12-sided polygon
dodecagon
13-sided polygon
13-gon
The sum of the exterior angles of ANY polygon is ______
360
The rule used to find the measure of one exterior angle of a regular polygon . . .
360/n where n is the number of sides (angles)
Rule for a reflection across the x-axis
(x,y) becomes (x, -y)
The x stays the same, and the y becomes its opposite
Rule for a reflection across the y-axis
(x, y) becomes (-x, y)
The y stays the same, and the x becomes its opposite
Rules for translations . ..
either add or subtract numbers to/from the coordinates.
If you translate to the right, what do you do to the coordinates?
You would add to the x-coordinate
If you translate to the left, what do you do to the coordinates?
You would subtract from the x-coordinate
If you translate up, what do you do to the coordinates?
You would add to the y-coordinate.
If you translate down, what do you do to the coordinates?
You would subtract from the y-coordinate
What is the rule for rotating 90 degrees clockwise?
(x, y) becomes (y, -x) You reverse the coordinates, and then you make the new y-coordinate its opposite.
What is the rule for rotating 90 degrees counterclockwise?
(x,y) becomes (-y, x) You reverse the coordinates, and then you make the new x-coordinate its opposite
What is the rule for rotating 180 degrees?
(x, y) becomes (-x, -y) You do not reverse your coordinates, but you make them both their opposites.
What do you do when you dilate a figure?
You multiply each coordinate by a given scale factor.
If the new image is bigger than the original, then the scale factor must be ________________________
A number greater than 1
If the new image is smaller than the original, then the scale factor must be a_________________________
A fraction less than 1