Home
::
About Us
::
Tutor in Your Home
::
Tutoring Center
::
SUMMER CAMP
::
Advertise With Us
::
College Counseling
::
Contact Us
Math is Fun
This site is an online mathematics and science school
where you can study without leaving your home (online education).
"
Do not worry about your difficulties in mathematics, I assure you that mine are greater
". Einstein, Albert (1879-1955)
Login
::
Sign Up - FREE
::
Refer a Friend
Study Guide
School of Logical Thinking
Tests Examples - Demo
Elementary Mathematics
High School Placement
Placement College Test
ACT
SAT
Flash Games
ACT
ACT Assessment
Test Description
English Test
Mathematics Test
Reading Test
Science Test
Writing Test
SAT
Early Mathematics
Study Guide
Arithmetic
Algebra
Geometry
Trigonometry
Polygon
A plane figure, formed by closed chain of segments, is called a
polygon
. Depending on a quantity of angles a polygon can be a triangle, a quadrangle, a pentagon, a hexagon etc. On Fig.17 the hexagon ABCDEF is shown. Points
A, B, C, D, E, F – vertices of polygon; angles
A ,
B ,
C ,
D,
E ,
F – angles of polygon; segments AC, AD, BE etc. are diagonals; AB, BC, CD, DE, EF, FA – sides of polygon; a sum of sides lengths AB + BC + … + FA is called a perimeter of polygon and signed as p (sometimes – 2p, then p – a half-perimeter). We consider only simple polygons in an elementary geometry, contours of which have no self-intersections ( as shown on Fig.18 ). If all diagonals lie inside of a polygon, it is called a convex polygon. A hexagon on Fig.17 is a convex one; a pentagon ABCDE on Fig.19 is not a convex polygon, because its diagonal AD lies outside of it. A sum of interior angles in any convex polygon is equal to 180 ( n – 2 ) deg, where n is a number of angles (or sides) of a polygon.
Return Back
View My Stats
Privacy Statement
© 2006 MathPlusFun, All Rights Reserved