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25 Cards in this Set
 Front
 Back
point

a location in space


line

a straight path that is endless in both directions


line segment

part of a line with two endpoints


ray

part of a line with one endpoint and endless in one direction


parallel lines

lines that will never intersect


perpendicular lines

lines that intersect at a right angle


angle

two rays with a common endpoint


Vertex

The point where rays, sides or edges meet.


right angle

an angel that measures 90 degrees: it makes a perfect square corner


acute angle

an angle that measure more than 0 degrees and less than 90 degrees


obtuse angle

an angle that measures more than 90% and less than 180 degrees


reflex angle

an angle that measure more than 180 degrees and less than 360 degrees


straight angle

an angle that measures 180 degrees. It is a straight line with a vertex . in the middle


polygon

a closed figure mode of line segments connected endpoint to endpoint on one plane. Where each segment intersects exactly one other segment at their common endpoint.


triangle

a polygon with three sides


quadrangle or quadrilateral

a polygon with 4 sides


right angle

a triangle with one right angle


acute angle

a triangle with three acute (an angle that measures more than 0 degrees and 90 degrees) angles


Scalene Triangles

a triangle with no sides of the same lengths


isosceles

a triangle with at least two sides the same length


equilateral triangle

a triangle with three sides the same length


Trapezoid

a quadrilateral with only one pair of parallel sides


parallelogram

a quadrilateral with two pairs of parallel sides.


rectangle

a parallelogram with four right angles.


rhombus

parallelogram with four sides of the same length
