Geometric Vocabulary

• Parallelogram

• Triangle

• Octagon

• Square

• Trapezoid

• Triangle

Lines that cross each other at exactly one point.

• line

• line of symmetry

• line segment

• intersecting lines

• parallel lines

A straight path of points in a plane that continues without end in both direction with no endpoints.

• line

• line of symmetry

• line segment

• intersecting lines

• parallel lines

Lines in the same plane that never intersect and are always the same distance apart.

• line

• line of symmetry

• line segment

• intersecting lines

• parallel lines

An imaginary line on a shape about which the shape can be folded so that that its two parts match exactly.

• line

• line of symmetry

• line segment

• intersecting lines

• parallel lines

A part of a line that includes two points called endpoints and all the points between them.

• line

• line of symmetry

• line segment

• intersecting lines

• parallel lines

Two lines that intersect to form four right angles.

• perpendicular lines

• line of symmetry

• line segment

• intersecting lines

• parallel lines

An angle that measures greater than 0^o and less than 90^o.

• perpendicular lines

• obtuse angle

• acute angle

• right angle

• straight angle

An angle that measures greater than 90^o and less than 180^o.

• perpendicular lines

• obtuse angle

• acute angle

• right angle

• straight angle