Math + Fun !
Home  ::   About Us  ::   Tutor in Your Home  ::   Tutoring Center  ::   SUMMER CAMP  ::   Advertise With Us  ::   College Counseling  ::   Contact Us
Our online tests allow your kids to test their math skills. We make sure that your kids are having fun while studying by combining testing and practice sessions with cleverly designed math games.
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
  School of Logical Thinking
  Tests Examples - Demo
  Elementary Mathematics
  High School Placement
  Placement College Test
  Flash Games
  ACT Assessment
  Test Description
  English Test
  Mathematics Test
  Reading Test
  Science Test
  Writing Test
  Early Mathematics
  Study Guide
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.

View My Stats
Math Plus Fun