# GEOMETRY

## GEOMETRY

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##### Presentation Transcript

1. SHAPES GEOMETRY

2. TRIANGLE – 3 SIDED SHAPE TRI MEANS 3 TRIANGLE

3. TRIcycle (3 wheels) TRIlogy (3 books in the series) (3 Horns)

6. Pentagon • A pentagon is a 5-sided shape. • “Pent” means 5 Pentagram – 5 pointed star U.S. Pentagon in Washington D.C.

7. HEXAGON • A hexagon is a 6-sided shape • “Hex” means 6 (Ask Jacob) Hexagram – 6-pointed star HEX nut – six sided nut Hexapod – 6 feet

8. HEPTAGON • A heptagon is a 7-sided figure • “Hept” means 7 Heptadactyly– 7 fingers on 1 hand Heptathlon – 7 event competition

9. OCTAGON • An octagon is an 8 sided figure • “Octa” means 8 Octogenarian – a person who is in there 80’s Octopus – 8 legs Octamom!

10. NONAGON • A nonagon is a 9-sided figure • From the Latin word “nonus” and the Greek word enneagonon, meaning 9 Enneagram – 9 personality types

11. DECAGON • A decagon is a 10-sided shaped • “Deca” means 10 Decimal – base 10 number system Decade – 10 years Decathalon – 10 track and field events

12. Let’s review PENTAGON HEXAGON heptagon DECAGON OCTAGON NONAGON

15. Let’s classify Polygon Quadrilateral Parallelogram Rhombus Polygon Quadrilateral Parallelogram Rhombus Rectangle Square!

16. Triangles A triangle has 3 sides and 3 angles

17. Types of triangles BASED ON HOW MANY SIDES AND ANGLES ARE EQUAL An EQUILATERAL triangle has 3 equal sides and 3 equal angles (always 60 degrees) An ISOSCELES triangle has 2 equal sides and 2 equal angles An SCALENE triangle has NO equal sides and NO equal angles

18. Types of triangles based on types of angles An ACUTE triangle is a triangle with ALL angles less than 90 degrees. A RIGHT triangle is a triangle with a 90 degree angle. An OBTUSE triangle is a triangle with an angle of more than 90 degrees.

19. A triangle can have two names isosceles right triangle

20. Triangles An equilateral triangle is always…. ACUTE

21. triangles In a right triangle, one of the angles is a right angle—an angle of 90 degrees. A right triangle may be isosceles or scalene. In an obtuse triangle, one angle is greater than a right angle—it is more than 90 degrees. An obtuse triangle may be isosceles or scalene. In an acute triangle, all angles are less than right angles—each one is less than 90 degrees. An acute triangle may be equilateral, isosceles, or scalene.

22. Your turn! • Draw each of the following: • Right isosceles triangle • Obtuse scalene triangle • An acute equilateral triangle

23. Right isosceles triangle 2. Obtuse scalene triangle 3. Acute equilateral triangles