Angles
Lines
Vocabulary
Triangles
100
Degrees in a full circle

What is 360o?

100
Goes on forever in both directions
What is a line?
100
What unit we use to represent the measurement of an angle
What are degrees?
100
Has three sides of equal length
What is an equilateral triangle?
200
49 degree angle
What is an acute angle?
200
Has two end points
What is a line segment?
200

Line through a figure such that when the figure is folded along the line, two halves are created that match up exactly

What is a line of symmetry?
200

All angles are less than 90o

What is an acute triangle?
300
Angle measurement of a straight line.

What is 180o?

300
Goes on forever in one direction
What is a ray?
300
The point where two or more lines meet
What is a vertex?
300

One angle is greater than 90o

What is an obtuse triangle?
400

A 172o angle

What is an obtuse angle?
400
Two lines that go on forever and never touch
What are parallel lines? 
400

Two angles that have a sum of 90o

What are complementary angles?
400
At least two sides are of equal length
What is an isosceles triangle?
500
This angle is formed by perpendicular lines. 
What is a right angle?
500

Two lines that cross but do not necessarily create a 90o angle

What are intersecting lines?
500

Two angles with a sum of 180o

What are supplementary angles?
500
All three sides are a different length
What is a scalene triangle?
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