Lesson 2 Geometry - PowerPoint PPT Presentation

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Lesson 2 Geometry

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Lesson 2 Geometry Review TYPES OF LINES Types of Angles Polygons Polygons are simple, closed, planar geometric figures whose sides are line segments. – PowerPoint PPT presentation

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Title: Lesson 2 Geometry


1
Lesson 2Geometry
  • Review

2
TYPES OF LINES
1. Parallel Lines
- Two lines that never intersect.
2. Perpendicular lines
- Two lines that intersect forming right angles.
3
Types of Angles
Right angle
- an angle with 90 degrees
- an angle between 0 90 degrees
Acute angle
Obtuse angle
- an angle between 90 180 degrees
Straight angle
- an angle with 180 degrees in it.
4
Polygons
  • Polygons are simple, closed, planar geometric
    figures whose sides are line segments.
  • The number of sides is the same as the numbers of
    angles.
  • Concave polygons have an indentation
  • Convex polygon has no indentations.

5
Types of Polygons
  • Triangles
  • Quadrilateral
  • Pentagon
  • Hexagon
  • Heptagon
  • Octagon
  • Nonagon
  • Decagon
  • Undecagon
  • Dodecagon
  • N- gon
  • Has three sides
  • Has four sides
  • Has five sides
  • Has six sides
  • Has seven sides
  • Has eight sides
  • Has nine sides
  • Has ten sides
  • Has eleven sides
  • Has twelve sides
  • Has N- sides

6
Types of Quadrilaterals
  • Has one set of parallel sides.
  • Has two sets of parallel sides
  • A parallelogram with all equal sides
  • A parallelogram with all right angles
  • A Rectangle with all equal sides.
  • Trapezoid
  • Parallelogram
  • Rhombus
  • Rectangle
  • Square

7
Regular Polygons
  • A regular polygon has all equal sides and all
    equal angles.
  • A square is an example of a regular
    quadrilateral.
  • Here are some other examples.

8
TRIANGLES
  • In regards to the angles
  • Right
  • has 1 right angle
  • Obtuse
  • Has 1 obtuse angle
  • Acute
  • Has all acute angles
  • Equiangular
  • All angles are equal.
  • In regards to the sides.
  • Equilateral
  • All sides are equal
  • Isosceles
  • 2 equal sides
  • Scalene
  • No equal sides.

9
Triangles
  • How many degrees are in the sum of the angles of
    a triangle?
  • 180 degrees
  • If you have a regular triangle how many degrees
    are in each of the three angles?
  • 180/3
  • 60 degrees.
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