Angles, Polygons,Shapes and Triangles
Vertical Angles
When two lines intersect, the angles that do not share a common side; vertical angles have equal measures
Pentagon
a five sided polygon
Quadrilateral
a four-sided polygon
Nonagon
a nine-sided polygon
Regular Polygon
a polygon with all sides and all angles equal
Rectangle
a polygon with four right angles
Square
a quadrilateral with four right angles and four congruent sides
Heptagon
a seven-sided polygon
Hexagon
a six-sided polygon
Decagon
a ten-sided polygon
Triangle
a three-sided polygon that is total to 180 degrees
Acute Triangle
a triangle with 3 acute angles (less than 90 degrees)
Scalene Triangle
a triangle with no two sides of equal length
Equilateral Triangle
a triangle with three congruent sides
Acute Angle
an angle less than 90 degrees but more than 0 degrees
Right Angle
an angle that measures exactly 90 degrees
Octagon
an eight-sided polygon
Vertex
the point of intersection of the two rays that form the sides of the angle
Circle
A collection of points in a plane that are all the same distance from a fixed point.
Rhombus
A four-sided polygon having all four sides of equal length.
Trapezoid
A four-sided polygon having exactly one pair of parallel sides.
Parallelogram
A four-sided polygon with two pairs of parallel sides.
Right Triangle
A triangle that has a 90 degree angle.
Obtuse Triangle
A triangle where one angle measures over 90 degrees.
Obtuse Angle
An angle that measures more than 90 degrees but less than 180 degrees
Adjacent Angle
Angles that are next to each other;adjacent angles have a common side, but no other overlap.
