1. Geometry Slideshow

2. POINT
A point is an exact location in space. A
Say “POINT A”

3. LINE
A line is a straight path of points that goes on and on in two directions. A B
Write
Say “LINE AB” A B

4. LINE SEGMENT
A line segment is a part of a line. It has two endpoints. A B
Write
Say “LINE SEGMENT AB” A B

5. RAY
A ray is part of a line. It has one endpoint and continues on and on in only one direction. F G
Write
Say “RAY FG” F G

6. ANGLE
An angle is formed by two rays that have the same endpoint. The common endpoint is the vertex. B A C
SAY:
1)”Angle A” (vertex)
2) “Angle BAC”
3)”Angle CAB”
Write A
BAC
CAB

7. ANGLE B A A BAC C CAB Write
QUESTION: WHY CAN’T WE CALL THIS ANGLE CBA or BCA?
ANSWER: The VERTEX letter must always be in the center when naming angles OR just by itself. B A
Write A
BAC C
CAB

8. PARALLEL LINES Never intersect (cross)
They are like the sides of a street
Parallel lines will never meet each other, no matter how much you continue them in either direction.

9. INTERSECTING LINES
Pass through the same point

10. PERPENDICULAR LINES Lines that intersect and form 4 right angles.
The little symbol marked in the corner means “right angle.”

11. RIGHT ANGLE
Measures 90 degrees
has a square corner

12. ACUTE ANGLE Measures less than a right angle (90 degrees)
It’s so cute! (Get it? Tiny? Acute?)

13. OBTUSE ANGLE Measures more than a right angle (90 degrees)
Less than 180 degrees
*Tubas are big and so are obtuse angles!

14. STRAIGHT ANGLE
Measures 180 degrees

15. POLYGONS Closed, flat plane figures with 3 or more lines segments
Is a circle a polygon? NO!

16. TRIANGLE
3 sides, 3 vertices
Right triangle

17. QUADRILATERAL 4 sides, 4 vertices Square Rectangle Trapezoid
Parallelogram
Rhombus

18. QUADRILATERAL Square: all sides are equal Rectangle: Trapezoid:
has 4 right angles, 2 sets of parallel lines
Trapezoid:
One set of parallel lines, one set of lines that will intersect
Rhombus:
Slanted square
Parallelogram:Slanted rectangle, opposite sides are parallel

19. PENTAGON
5 sides, 5 vertices

20. HEXAGON
6 sides, 6 vertices

21. HEPTGON
7 sides, 7 vertices

22. OCTAGON
8 sides, 8 vertices

23. NONAGON
9 sides, 9 vertices

24. DECAGON
10 sides, 10 vertices

25. 3D shapes