## Tuesday, March 24, 2009

### Scribe Post for March 23, 2009

Yesterday in class, we started off with "Number of the Day". The number of the day was 8756.934. Then we took some notes on perpendicular bisector and angle bisector.

Here are the notes:

Bisect: -Bi means "two"

-sect means "cut"

-so bisect means to cut in two

Perpendicular Bisector

A line that divides a line segment in half and is at right angles to it

eg.

How can you create or draw a perpendicular bisector?

1. Free hand, o.k. but not perfect

2. Protractor gets us 9o degree angle

-Ruler cuts line in half

eg.

3. Use a compass and create arcs
eg.

a) Open compass to greater than half the distance of line

b) Place compass on point A, draw an arc

c) Place compass on point B, draw an arc

d) Use a ruler to connect the intersections of the arcs that line is a perpendicular bisector

Angles

Angle: the figure formed by two lines with a common endpoint called a vertex

eg.

Acute angle: less than 90 degrees

eg.

Obtuse angle: more than 90 degrees

- less than 180 degrees

eg.

Angle bisector: the line that divides an angle into two equal parts

eg.

How do we make an angle bisector?

1. Free hand not perfect not accurate enough

2. Protractor

eg.

3. Compass

eg.

a) Arc from vertex

b) Arc from point S (intersection of line and arc)

c) Arc from point T (intersection of line and arc)

d) Line from arc intersections to vertex that is your angle bisector

After taking down all the notes, we worked on page 116-121 (Math Links)

I pick Telissa to do the next scribepost

devin772 said...

good job mary jane i liked the pictures and the notes u put on here

Ronny 772 said...

wow mary jane, nice picture and colors you used, you kind of made tons of extra spaces at the end and telissa has already done the post

gilbert772 said...

Good Job Maryjane nice picture and colors you put but why was there lots of space at the end Good job anyways.

argie772 said...

Good Job Maryjane! Good pictures, nice colors. i think you should take away all the extra space at the end.
well good job again.

Telisa72 said...

Umm I liked the pictures and colours but there was alot of space at hte end and i have already done the scribepost but ok

althea772 said...

good job Jhane!
you explained everything so well..and you also added pictures,colors..but you should take away the extra spaces.

Jennifer72 said...

great job mary jane .
but there was a lot of spaces at the end .

Ralph772 said...

Good Job! I liked how you put all the notes down. I also how you put a picture and colours. What was with the giant gap at the end though? Good Job!

MaryJane772 said...

Sorry about the space at the end, I wasn't able to take the big space out because there was something wrong with my computer.

Carla772 said...

Great Job Mary Jane ! (:
but there was lots of space at the end ,, other than that GOOD JOB !

celdrickpetilla7-72 said...

7 WORDS: RESPECT!!