lines__angles___polygon by lanyuehua

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									Lines, Angles & Polygons


    Vocabulary Review
 Angle Sizes
 Straight angle: measures 180°
                 180°


 Right angle: measures 90°

 Acute angle: measures less than 90°

 Obtuse angle: measure is greater than 90° but
                less than 180°
Lines
 Perpendicular Lines: 2 lines that intersect at
                        a right angle

 Parallel Lines: 2 lines in the same plane that
                  do not intersect



 Transversal: line that intersects 2 parallel
                lines
 Angle Pairs
 Complementary Angles: Sum of angles is 90°

 Supplementary Angles: Sum of angles is 180°

 Vertical Angles: Form an “X”; have
                      equal measures
 Alternate Interior Angles: Opposite transversal; inside
                                   parallel lines

 Alternate Exterior Angles:      Opposite transversal;
                                    outside parallel lines
Angles & Angle Pairs

                           1       2
                       3       4



           5       6
       7       8
Polygons
Polygon: Closed figure whose sides are line
segments that intersect only at their endpoints

Regular Polygon: polygon whose sides are all
equal and whose angles are all equal
 Triangles              Quadrilaterals
     Acute Triangle       Trapezoid
     Obtuse Triangle      Parallelogram
     Right Triangle       Rhombus
                           Rectangle
                           Square
Triangles
 Acute Triangle    all acute angles
 Obtuse Triangle   1 obtuse angle
 Right Triangle    1 right angle
Quadrilaterals
 Trapezoid       1 pair of parallel sides
 Parallelogram   both pairs of opposite sides
                  parallel
 Rhombus         parallelogram with 4 sides of
                  equal length
                  parallelogram with 4 sides of
 Rectangle
                  equal length and 4 right
                  angles
                  parallelogram with all equal
 Square          sides and all right angles
Quadrilaterals

								
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