Exam Review

Define

Perpendicular- Two lines that intersect at a right angle.
Parallel- Lines that never cross or intersect.
Intersecting- When lines cross at any angle.
Perpendicular Bisector- A line that divides a line into exactly two.
Angle Bisector- A line that divides an angle into exactly two.
Acute Angle- An angle that is smaller than 90 degrees.
Obtuse Angle- Any angle that is larger than 90 degrees but smaller than 180 degrees.
Right Angle- a 90 degree angle.
Formula for the Area of a Triangle- b x h divided by two.
Formula for the Area of a Parallelogram- b x h.

Label

Perpendicular

Perpendicular Bisector



Intersecting

Parallel

Find the Area of the Parallelogram


a= b x h

a= 50 x 20

a= 1000m2

Find the Area of the Triangle

a= b x h divided by 2

a= 10 x 12 divided by 2

a= 120 divided by 2

a= 60m2

Label

Acute Angle

Angle Bisector

Obtuse Angle

Right Angle

Convert Fractions, Decimals and Percents

Fractions are out of any whole number.

Percent is out of 100.

Decimals are out of 1.

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How to Find the Area of a Triangle

A triangle is a three sided figure that has three angles.
For example:
A triangle is half of a parallelogram. So the formula to find the area of a triangle is (b-base x h-height) divided by 2 (to get the height of a triangle you make a parallel
line from the base to the tallest vertex).
For example the base of the triangle is 2 cm and the Height of the triangle is 4 cm

First you have to multiply the 2 by the 4 to get 8

Then you divide 8 by 2 to get the area which is 4 cm
Here is a site that can help

here is a video