Angles, Polygons,Shapes and Triangles

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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.


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