Exam Review Study Guide

Define

Perpendicular- lines that intersect at right angles. (90 degrees)
Parallel- lines in the same place that never cross, or intersect.
Intersecting- lines that cross at any angle.
Perpendicular Bisector- a line that divides another line segment in half and has right angles.
Angle Bisector- the line that divides an angle into two 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- an angle that is exactly 90 degrees.
Formula Area of Triangle- bxh divided by 2
Formula Area of Parallelogram- bxh


Label















Parallel





















Perpendicular Bisector


















Perpendicular
















Intersecting


Find the area of the parallelogram


















A= bxh
A= 50 x 20
A= 1000 m2


Find the area of the triangle




















A= bxh divided by 2
A= 10x12 divided by 2
A= 120 divided by 2
A= 60 m2


Label

















Acute Angle
















Obtuse Angle


















Right Angle
















Angle Bisector


Convert fractions, decimals, percents


















Fraction out of any whole number
Percent out of 100
Decimal out of 1

Convert 2/5 into % and decimal




















Here is a video.





Here is a link about decimals, fractions and percents.

Order of Operations

There are 4 operations.
-addition
-subtraction
-multiplication
-division

Addition and subtraction are brothers and multiplication and division are sisters.

B E D M A S stands for:

Brackets ( )
Exponents
Division
Multiplication
Addition
Subtraction

1st- brackets ( )
2nd- exponents
3rd- divide or multiply in order from left to right.
4th- addition or subtraction in order from left to right.

6.4+120x1.25=
6.4+150=
156.4

Change this equation so the answer is 158.

The way you change the equation so the answer becomes 158 is you have to put brackets around 6.4+120.
(6.4+120)x1.25=
126.4x1.25=
158

What sign goes where? +, division sign

5.2__4__2.1=3.4

Here's the answer.

5.2 divided by 4+2.1=

1.3+2.1=

3.4

2x3 divided by 6+(2-1)=

2x3 divided by 6+(2-1)=

2x3 divided by 6+1=

6 divided by 6+1=

1+1=

2

(0.75-0.5)x(4.2 divided by 0.6)+7.3-1.2=

(0.75-0.5)x(4.2 divided by 0.6)+7.3-1.2=

0.25x7+7.3-1.2=

1.75+7.3-1.2=

7.85

Here is a link for more about the Order of Operations.

Annie has been asked to calculate 1.7+6 divided by 2. She claims the answer is 3.85. Do you agree? Explain why or why not.

1.7+6 divided by 2=

1.7+3=

4.7

I do not agree because when I simplified then calculated it, the answer I got was 4.7.