Transcript angle

Geometry Basic
Vocabulary
Point
• A point marks an exact location in
space.
• It has no size. It is infinitely small.
• Use a capital print letter to name a
point.
Line
• A line is an endless straight path.
• It is the infinitely straight arrangement
of points.
• Use any two points on the line to
name the line.
J
AG or GA or
JG or AJ…
Line Segment
• A line segment is part of a line
between two endpoints.
• Use the two endpoints to name the
line segment.
AG or GA
Ray
• A ray is part of a line that has
one endpoint and goes on
forever in one direction.
• Use the endpoint and one other
point on the ray to name a ray.
Endpoint first. ALWAYS!
Ray GA
Or
GA
Plane
• A plane is an endless flat surface.
• Use three points that are not on a line
to name the plane or the capital
cursive letter in the corner.
Plane GFH
Or
Plane
B
B
Angle
• An angle is formed by two rays with the same
endpoint.
• An angle can be named by three letters – a point
from each side and the vertex as the middle letter.
• If there are no other angles at the vertex, it can
also be named by a single letter, its vertex.
<GFH or <F
Right Angle
• A right angle measures 90°
blue box
indicates
a right
angle
Acute Angle
• An acute angle is greater
than 0 and less than 90°
60°
Obtuse Angle
• An obtuse angle is greater
than 90 and less than 180°
140°
Straight Angle
• A straight angle measures
180°.
• Also known as a line.
Intersecting Lines
• Intersecting lines are lines
that cross at one point.
Parallel Lines
• Parallel lines are lines in a
plane that never intersect
and are the same distance
apart at every point.
Perpendicular Lines
• Perpendicular lines are
lines that intersect to form
four right angles.