30 terms

# Common Core Geometry Terms

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perpendicular lines
Two lines that intersect to form right angles
intersecting lines
lines that cross at one point
parallel lines
lines in the same plane that never intersect
vertex
The common endpoint of an angle
congruent
Having the same size,length or angle measure
polygon
a closed 2-dimensional shape formed by three or more straight line segments.
trapezoid
a quadrilateral with exactly 1 pair of parallel sides
parallelogram
A quadrilateral opposite sides are congruent and parallel,no right angles
rectangle
a parallelogram with 4 right angles
rhombus
a parallelogram with 4 congruent sides,no right angles
square
a parallelogram with 4 right angles and 4 congruent sides
isosceles triangle
a triangle with two congruent sides
obtuse triangle
a triangle with 1 angle greater than 90 degrees
equilateral triangle
A triangle with 3 congruent sides and 3 congruent angles
scalene triangle
a triangle with no congruent sides
right triangle
a triangle with one 90 degree angle
acute triangle
A triangle with three angles less than 90 degrees.
a polygon with four sides,the general term
pentagon
a five-sided polygon
hexagon
a polygon with 6 sides
octagon
A polygon with 8 sides
regular polygon
a polygon with all sides and all angles equal or congruent
faces
flat/plane polygons that make up the sides of a 3-dimensional solid
vertices
points or corners of a polygon or 3-dimensional solid
edges
a line segment where two faces meet on a 3-dimensional solid
net
a 2-dimensional representation of a 3-dimensional solid
area
The number of square units needed to cover a given polygon
dimensions
The length, width, and height of an object being measured.
surface area
The sum of all the areas of all the faces of a 3-dimensional solid.
volume
The amount of space inside a 3-dimensional solid measured in cubic units.