Triangle
4
Quadrilateral
5
Pentagon
6
Hexagon
7
Heptagon
8
Octagon
9
Nonagon
10
Decagon
12
Dodecagon
15
Pentadecagon
n
n-gon (number of sides - gon)
Midline Theorem
A segment joining the midpoints of two sides of a triangle is parallel to the third side, and its length is one-half the length of the third side
No Choice Theorem
If two angles of one triangle are congruent to two angles of a second triangle, then the third angles are congruent
AAS
If there exists a correspondence between the vertices of two triangles such that two angles and a nonincluded side of one are congruent to the corresponding parts of the other, then the triangles are congruent
The sum Si of the measures of the angles of a polygon with n sides is given by the formula:
si=(n-2)180
If one exterior angle is taken at each vertex the sum Se of the measures of the exterior angles of a polygon is given by the formula:
Se=360
The number d of diagonals that can be drawn in a polygon of n sides is given by the formula:
d= n(n-3)/2
The measure of E of each exterior angle of an equiangular polygon of n sides is given by the formula
E= 360/n
regular
both equilateral and equiangular
regular quadrilateral
square
regular triangle
equilateral triangle
1 interior angle equation
I=180(n-2)/n
What is the sum of exterior angles?
360 (Se=360)
Ace