Intro Vocab
What is the study of shapes?
Geometry
When two lines, line segments, or rays run right next to each other without gaining or losing any distance between them, they are...
parallel
What is formed when two line segments or rays share a common endpoint?
An angle
A simple, closed, flat figure made up of line segments is a...
polygon
A polygon with 7 sides and vertices is called a...
heptagon (septagon)
A specific location on a plane is called a...
point
Whenever two lines, line segments, or rays cross over one another, they are...
intersecting
The common endpoint in an angle is called a...
vertex
A polygon with 3 sides and vertices is called a...
triangle
A polygon with 8 sides and vertices is called an...
octagon
A set of points that goes on forever in both directions is called a...
line
When two lines, line segments, or rays intersect so that they form a perfect cross, they are...
perpendicular
Angles that measure exactly 90 degrees are called...
right angles
A polygon with 4 sides and vertices is called a...
quadrilateral
A polygon with 9 sides and vertices is called a...
nonagon
Part of a line between two endpoints is a...
line segment
Draw 2 intersecting lines.
Answers vary.
Angles that measure less than 90 degrees are called...
acute angles
A polygon with 5 sides and vertices is called a...
pentagon
A polygon with 10 sides and vertices is called a...
decagon
Part of a line segment that starts at an endpoint and goes on forever in only one direction is called a...
ray
Draw 2 lines that will never intersect.
Answers vary.
Angles that measure more than 90 degrees but less than 180 degrees are called...
obtuse angles
A polygon with 6 sides and vertices is called a...
hexagon
Do polygons always have a matching number of sides and vertices?
Yes!