Lines
Two lines that are the same distance apart and will never touch:
Parallel lines
A 90 degree angle is called:
A right angle
Name the property: a=a, <A =<A
Reflexive property of equality
When writing a two column proof, you have ___________ and __________ at the top of each column.
Statements and reasons
What is a shape that has 6 sides?
Hexagon
Lines that intersect to form a right angle:
Perpendicular
An angle that is less than 90 degrees:
An acute angle
Name the Property: If a=b and b=c then a=c
Transitive property of equality
When writing properties, you should always make sure to do what?
Write out the property and add if it is of congruence or equality
What is a shape with 5 sides?
Pentagon
This has one endpoint and continues in one direction forever:
A ray
An angle that is greater than 90 degrees:
An obtuse angle
Name the property: If a=b then a+c= b+c
Addition property of equality
What is a theorem?
A statement that needs to be proven
A linear pair has one angle that is 135 degrees. What is the measure of the other angle?
45 degrees
Part of a line:
A line segment
Two angles added together is known as what postulate?
Angle Addition Postulate
Name the property: If a=b, then a-c=b-c
Subtraction property of equality
How many steps can a proof have?
Anywhere from two to infinite steps, but typically fewer than ten.
A quadrilateral has 3 angles measuring 90 degrees, 100 degrees, and 70 degrees. What is the measure of the 4th angle?
100 degrees
When two segments are added together it is known as what postulate?
Segment addition postulate
This tool is used to measure angles:
A protractor
Name the property: AB= 5 and AB + BC = AC, then 5 + BC = AC
Substitution property of equality
The reason that you always write for the first statement (and sometimes the second or third, etc.) is always ___.
"Given"
A boat has a sail with one pair of perpendicular lines, and two sides the same length. What kind of triangle is it?
A right isosceles triangle