Vocabulary
Triangles
Classifying 2D Shapes
Angles
Lines
Measuring
100
What is this called?
A ray
100
A triangle has at least _____ acute angles?
What is 2.
100
How many sides does a quadrilateral have?
4
100
Angles that measure less than 90 degrees.
Acute angles
100
A figure can be folded in half to create a mirror image
line of symmetry
100
We measure angles in ____?
Degrees
200
I am a fixed location on a line
A Point
200
What is this triangle called? 
Acute Triangle
200
Which is not always an attribute of a rectangle?
A. opposite sides are parallel
B. opposite sides are equal in length
C. all sides are equal in length
D. all angles are right angles
C. all sides are equal in length
200
Angles that measure between 91 and 179 degrees.
Obtuse angles
200
Parallel lines cross at a 90 degree angle - True or False?
False
200
Space between two rays that meet at an endpoint.
Angle
300
What is this called?
Line Segment
300
What makes a triangle obtuse?
one obtuse angle and two acute angles
300
True or False: A rhombus has to have all right angles?
False
300
What type of angle is 90 degrees?
right angle
300
Lines that meet or cross.
Intersecting lines
300
When two angles equal 180 degrees.
Supplementary angles
400
The point where two line segments or rays meet.
Vertex
400
What makes a triangle right?
One right angle and two acute angles
400
True or False? A rhombus has to have all equal sides
True
400
What type of angle is this angle?
Obtuse
400
Two trains leave the subway station in opposite directions. What type of lines are they creating?
Parallel Lines
400
What is the measurement of this angle? What kind of angle is this?
75, acute
600
A straight path that goes on forever in two directions.
Line
600
When you add all three angles of a triangle, you will always get this number...
180
600
True or False: A square has to have all right angles
True
600
How many degrees are in a straight angle?
180 degrees
600
What are line segments that intersect at an angle of 90 degrees
Perpendicular lines
600
Adam found the measurement of an angle to be 35 degrees. The angle was actually 145 degrees. What mistake did Adam make?
He looked at the wrong scale (top instead of bottom or bottom instead of top) on the protractor.