Exam Review Study Guide-

DEFINE:
Perpendicular- Describes lines that intersect at right angles. (90 degrees)
Parallel- Describes lines in the same plane that never crosses or intersect.
Intersecting- Lines that cross at any angle.
Perpendicular Bisector- A line that divides a line segment in half and meet at 90 degrees.
Angle Bisector- The line that divides an angle into 2 equal parts.
Acute angle- An angle that is less than 90 degrees.
Obtuse angle- An angle that is greater than 90 degrees and less than 180 degrees.
Right angle- is exactly 90 degrees.

Formulas :
Area of a triangle= bxh divided by 2.
Area of a parallelogram= bxh




Base- 50m Height-20m. Find the Area of the Parallelogram.
A= bxh
A= 50x20
A= 1000m "squared"

Find the area:
A= bxh/2
A= 10x12/2
A=120/2
A= 60m "squared"




CONVERT:
fractions->decimals->Percents
3/4 = 75/100= 0.75/1

- Fractions are out of any whole number.
-Percentages are out of 100
-Decimals are out of 1

2/5= 40/100 --> 2/5=0.4/1


Remember to start studying for our exams !

12/14/09- Math Notes

What We Did Today-
Convert each fraction to a decimal number. Round each decimal to the indicated place value, then convert to a percent.
A) 27/56 (tenths)

0.4821428

0.5 x100
= 50%

B) 125/396 (thousandths)
0.3156565
0.316 x100
= 31.6%

C) 1496/2005 (hundredths)
0.746134663
0.75 x100
= 75%

Repeating Decimals- A decimal number with a digit or group of digits that repeats forever... Repeating digits are show with a bar example-
Use a calculator to convert these fraction to a repeating decimal-
A) 1/3 = 0.3333333 OR 0.3 with a bar on the top of the three.
B) 5/9 = 0.5555555 OR 0.5 with a bar on the top of the five.
C) 5/6 = 0.8333333 OR 0.83 with a line on top of the 3

Terminating Decimals-
A decimal number in which the digits stop examples include 0.4, 0.86, 0.125

Homework-
Find each of the following as a percent-
a) 23 out of 80
b) 421 out of 560

Change each terminating decimal number to a fraction-
a) 0.48
b) 0.078
Simplify the expression-



Lastly, construct an angle bisector of a 60 degree angle

Remember, it's the dance on Friday, Be sure to finish ALL your work.
+ Be free to ask questions.