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Acute Angle
An acute angle is an
angle that has a measure
less than a right angle
(less then 90 degrees)
Angles
A right angle is an angle
that is 90˚.
DECAGON
A Decagon is
a polygon with
ten sides.
Dodecagon
A polygon with twelve
side sides.
Equilateral
Triangle
An equilateral
triangle has three
congruent sides.
Hendecagon
An eleven
sided
polygon.
HEPTAGON
A Heptagon is a
seven sided
polygon.
Hexagon
A six sided polygon
Intersecting
Lines
Intersecting lines are
lines that cross each
other at exactly one point.
Isosceles
Triangle
A triangle with two
equal sides
LINE
A straight path in a plane extending in both directions
with no end points
LINE SEGMENT
A part of a line that includes
two points called endpoints and
all the points between them.
Nonagon
A nonagon is a nine sided
polygon.
obtuse
An angle that has a measure
greater than a right angle
OCTAGON
AN OCTAGON IS AN
EIGHT SIDED
POLYGON.
Parallel lines
Parallel lines are lines that
never intersect and are always
the same distance apart.
Parallelogram
A quadrilateral whose
opposite sides are parallel
and congruent.
Perpendicular Line
Perpendicular Lines are two
lines that intersect to form
four right angles.
Plane
A flat surface that extends
without ending in all directions.
Point
A point is an
exact location
in space.
Polygon
A polygon is a closed shape with
straight sides.
Quadrilateral
A polygon
with four
sides.
Ray
A part of a line with one end
point that continues without
end in one direction.
rectangle
A four sided polygon.
Rhombus
A parallelogram with four
congruent sides.
Right Angle
A right angle is 90˚.
Scalene
A triangle with no
congruent sides.
Square
A quadrilateral with four
equal sides and four right
angles.
Straight Angle
A straight angle
is an angle that
measures 0 degrees
at the vertex.
Trapezoid
A quadrilateral
with one pair
of parallel
sides.
triangle
A three sided object
with three angles.
VERTEX
A vertex is where two
lines come together.