Geometry

Lines

100

two lines that are the same distance apart and will never touch

What is parallel lines

200

lines that intersect to form a right angle

What is perpendicular

300

this has one endpoint and continues in one direction forever

What is a ray

400

This is part of a line

What is a line segment

500

A line that crosses the midpoint of the segment at right angles.

What is the perpendicular bisector?

Angles

100

This is the term for a 90 degree angle

What is right angle

200

An angle that is less than 90 degrees

What is acute

300

an angle that is greater than 90 degrees

What is obtuse

400

this is the number of degrees in a straight angle

What is 180 degrees

500

This is used to measure angles

What is a protractor

Triangles

100

A triangle that has all sides the same length

What is equilateral

200

A triangle with two sides the same length

What is isosceles

300

A triangle with one angle greater than 90 degrees

What is obtuse triangle

400

A triangle with a 90 degree angle.

What is a right triangle?

500

All angles in every triangle will add up to this number of degrees

What is 180 degrees

Circles

100

A tool used to draw circles.

What is a compass?

200

A line segment across the middle of the circle.

What is the diameter?

300

A line segment from the center to the edge of the circle.

What is a radius?

400

This is the definition of a circle

What is the set of points equidistant from a central point?

500

This is what any radius of a circle has in common with any other.

What is the same length?

Miscellaneous

100

A drawing made with only a compass and straight edge.

What is a construction?

200

This has no length or width, and is the beginning of any construction.

What is a point?

300

A shape with six sides.

What is a hexagon?

400

Two figures that are the same size and shape.

What are congruent figures?

500

A closed figure with at least three sides.

What is a polygon?