Vocabulary
Angles
Classifying Triangles by Sides and Angles
Lines
Identify this Triangle
100
This is an exact location in space, and is represented by a dot. .
What is a point?
100
This is an angle that measures exactly 90°.
What is a right angle?
100
This triangle has 3 congruent sides.
What is an equilateral triangle?
100
This is what you call two lines that meet at a 90° angle.
What are perpendicular lines?
100
30°, 60°, 90°
What is a right triangle?
200
This is a set of points that form a straight path that goes in opposite directions without ending. <----------------------------------->
What is a line?
200
This is an angle that measures greater than 0° and less than 90°.
What is an acute angle?
200
This triangle has 2 congruent sides.
What is an isosceles triangle?
200

This is what you call two lines that are the same distance apart and never intersect.

What are parallel lines?

200
4 cm, 6 cm, 4 cm
What is an isosceles triangle?
300
This is a line that has an endpoint and goes on forever in one direction. .----------------------->
What is a ray?
300
This is an angle that measures greater than 90° and less than 180°.
What is an obtuse angle?
300
This is a triangle with no congruent sides.
What is a scalene triangle?
300
This is what you call two lines that meet at one point?
What are intersecting lines?
300
12 in, 1 ft, 12 in
What is an equilateral triangle?
400
This is part of a line between two endpoints. <--.------------------.-->
What is a line segment?
400
This is an angle that measures exactly 180°.
What is a straight angle?
400
This is a triangle with 1 obtuse angle and 2 acute angles.
What is an obtuse triangle?
400
This is what you call two line segments that are the same length.
What are congruent line segments?
400
130°, 20°, 30°
What is an obtuse triangle?
500
This is a flat surface that goes on forever in all directions.
What is a plane?
500
This is an angle that measures greater than 180°.
What is a reflex angle?
500
This is a triangle with 3 acute angles.
What is an acute triangle?
500

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This is an example of these kind of lines

What are parallel lines?

500
5 m, 8 m, 6 m
What is a scalene triangle?
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