Pre-Algebra: Chapter 11-8
Polygons
Polygons are simple, closed sided figures (in a plane) that are formed with at least 3 line segments. The points of intersection are called the vertices (the plural of vertex).
A diagonal is a line segment that joins 2 NONCONSECUTIVE (not right next to each other) vertices. You can draw diagonals in any polygon with more than 3 sides.
If a polygon has “n” sides, the “n” – 2 triangles are formed and the sum of the degree measures of the interior angles of the polygon is (n – 2)*180°
Algebra: Chapter 13-5
Solving Rational Expressions
Remember, we solve rational equations by multiplying both sides by the LCM of all the denominators. This can result is a quadratic equations. Sometimes, there can be extraneous solutions, so … you should always check all possible solutions. Practice makes perfect, use ANY method to factor, box, tables, graphs, even the quadratic formula.
Here are some more examples too.