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9.1
9.2
9.3
9.4
9.1-9.4
100
A position in space represented with a dot.
What is a point.
100
A figure formed by two rays with the same endpoint.
What is an angle.
100
An angle whose measure is exactly 90 degrees.
What is a right angle.
100
A closed plane figure with three straight sies that connect three points.
What is a triangle.
100

Two angles whose sum is equal to 90 degrees.

What are complementary angles.

200
A set of connected points that extend without end in two opposite directions.
What is a line
200
The endpoint of the rays that form the angle.
What is the vertex.
200
An angle whose measure is less than 90 degrees.
What is an acute angle.
200
A triangle with three acute angles.
What an acute triangle.
200

Two angles whose sum is equal to 180 degrees.

What are supplementary angles.

300
A part of a line that has one endpoint and extends without end in the opposite direction.
What is a ray.
300
A unit used to measure angles.
What is a degree.
300
An angle whose measure is greater than 90 degrees but less than 180 degrees.
What is an obtuse angle.
300

A triangle that has one right angle.

What is a right triangle.

300
A triangle with at least two sides the same length.
What is an isosceles triangle.
400
A part of a line that consists of two endpoints and all the points between them.
What is a segment.
400
A semicircular too used to measure degrees.
What is a protractor.
400
An angle whose measure is exactly 180 degrees.
What is straight angle.
400
A triangle with one obtuse angle.
What is an obtuse triangle.
400
A triangle with three sides of different lengths.
What is a scalene triangle.
500
A flat surface that extends without end in all directions.
What is a plane.
500
The symbol used to represent an angle.
What is <.
500
Angles formed opposite one another when two lines intersect.
What are vertical angles.
500
A triangle with three sides of equal lenght.
What is an equilateral triangle.
500
Lines in the same plane that never meet.
What are parallel lines.