two lines in the same plane that never intersect

a straight path that extends infinitely in opposite directions

a point at the end of a line segment or ray

the distance around a closed, two-dimensional figure

a tool used to measure angles

a unit used to measure the size of an angle; the symbol is a small circle.

two or more angles that share a common ray, have a common vertex, and do not overlap

the number of square units needed to cover a surface with no gaps or overlaps

the point where two rays meet, where two sides of a polygon meet, or where the edges of a polyhedron meet; the top point of a cone or pyramid.

intersecting at right angles

a part of a line with two endpoints

a part of a line that has one endpoint and extends infinitely in the other direction

measurement of a geometric shape in one directions

an angle with a measure of 180 degrees

an angle measuring more than 90 degrees, but less than 180 degrees

to cross at a common point

the figure formed by two rays that extend from a common endpoint

an angle with a measure of 90 degrees

figures that are the same size and shape

an exact location or position; may be represented by a dot

an angle measuring less than 90 degrees

two lines that cross at exactly one point

never meeting or intersecting; always the same distance apart.