Geometry Vocabulary
Classifying Angles
Finding Angle Measures
Classifying Polygons
Classifying Triangles
100
A ray
Part of a line that has one endpoint and extends without end in one direction. Draw an example.
100
An acute angle.
An angle that measures less than 90 degrees. Draw an example.
100
Adjacent Angles
The name for two angles that are side by side and have a common vertex and ray. They may or may not be congruent.
100
yes. Closed figure, each line segment connect two other segments, 3 or more line segments.
Determine whether this is a polygon. Why or why not?
100
isosceles triangle
What is the name of the triangle that has at least 2 congruent sides?
200
Obtuse Angle
An angle that measures more than 90 degrees and less than 180 degrees. Draw an example.
200
180 degrees.
A straight angle measures ____ degrees. Draw an example.
200
30 degrees.
What is the measure of <B?
200
heptagon
What is the name of this polygon?
200
By the measure of its sides and by the measure of its angles.
What are the two ways that you can classify a triangle?
300
Vertex
An angle is formed by two rays with a common enpoint, called the ___________. Draw an example.
300
Right Angle.
When it's 3:00, what type of angle is made with the hands on the clock? Draw it.
300
65 degrees
What is the measure of angle <2?
300
A polygon in which all sides are congruent and all angles are congruent.
What is the definition of a regular polygon?
300
118 degrees. Obtuse triangle.
Find angle Y and classify the triangle.
400
Vertical Angles
Two angles that are formed by two intersecting lines and are not adjacent. These angles have the same measure (ALWAYS congruent). Draw an example.
400
Acute angles.
If two angles create a right angle, what type of angle must those two angles be? Draw an example.
400
45 degrees
What is the measure of <A?
400
nine sides and nine angles.
How many sides and angles does a nonagon have?
400
31 degrees. Right triangle.
Find angle X and classify triangle.
500
A scalene triangle.
A triangle that has NO congruent sides. Draw an example.
500
Supplementary Angles
What is the name for two angles that create a straight angle (180 degrees)? Draw an example.
500
<1 = 38 degrees <2 = 42 degrees <3 = 48 degrees
Find of the measure of <1, <2, and <3?
500
sides
When determining whether two triangles are congruent, you only need to determine whether the _______ are congruent.
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