1. Do Now 4/1/13 Copy HW in your planner. Be ready to copy POTW #2
Text p. 312, #1-16 all, 21
Be ready to copy POTW #2

2. Objective SWBAT identify and describe geometric figures
In your notebook, list as many words as you can that can be associated with “geometry.” For each word draw the matching symbol or figure.

3. Section 8.1 “Building Blocks of Geometry”
Point
an exact location, represented as a dot. L A D Z K

4. Plane a flat surface that extends on forever in all directions.
How many planes on this figure?

5. Line segment
part of a line with 2 endpoints and all the points in between. D E C F

6. Line a straight path extending without end in opposite directions. R S

7. Ray Part of a line that begins at a point and extends in one
direction without ending. B K A J AB K JK A

8. Identifying Points, Lines, and Planes
Identify the figures in the diagram. G H I F
A. four points
H, G, I, and F
Choose any two points on a line to name the line.
B. two lines
IH, HF
C. a plane
plane IGF
Choose any three points, not on the same line, in any order.

9. Identifying Line Segments and Rays
Identify the figures in the diagram. M N O
A. three rays
Name the endpoint of a ray first.
MN, NM, MO
B. two line segments
Use the endpoints in any order to name a segment.
MN, MO

10. “Similar Figures” Similar Figures
Remember this?
Similar Figures
Two figures are SIMILAR FIGURES if they have the same shape but not necessarily the same size. The symbol ~ indicates two figures are similar.
Properties of similar figures:
1). Corresponding angles are congruent
2). Corresponding sides are proportional (equal ratios)

11. Corresponding angles –
Remember this?
Corresponding angles –
matched angles of two figures
When 2 angles have the same measure, they are marked with the same symbol. D A F E C B

12. Corresponding sides – matched sides of two figures Remember this? D A

13. Congruent
Two line segments are congruent when they are the same length. 3 C D E F
You can use tick marks to indicate congruent line segments.

14. Congruent Figures
Two figures are CONGRUENT FIGURES if they have the same shape AND the same size.
Properties of congruent figures:
1). Corresponding angles are congruent
2). Corresponding sides are congruent

15. Identifying Congruent Line Segments
Identify the line segments that are congruent in the figure.
AB CD
One tick mark
AC BD
Two tick marks
BF DF EC AE
Three tick marks
The symbol means “is congruent to.”
Reading Math

16. Identifying Congruent Line Segments
Identify the line segments that are congruent in the figure. A B C D E
AB AC
One tick mark
BC DE
Two tick marks
BD CE
Three tick marks

17. Given , find the indicated measure.Z A X 15 45 20 45 Y
35° 15 B C
90°
35°
55°

18. Puzzler…
Remove 4 of the segments to leave 5 equal squares.

19. Homework
Text p. 312, #1-16 all, 21

20. Homework Text p. 307, #2-32 evens
2) ordered pair
4) integer
6) 6%
8) 104%
10) 0.8
12) 1.31
14) 12
16) 81
18) 563.2
20) 118
22) 32
24) 104
26) 56
28) (3,3)
30) (5,1)
32) (6,4)