Quadrilaterals Vocabulary and Symbols

Lines that intersect forming 2 acute and 2 obtuse angles

Lines that form 4 right angles

Lines that never intersect or cross

Lines that intersect forming 2 acute angles

An angle that measure less than 90 degrees

An angle that measures exactly 90 degrees

An angle that measures greater that 180 degrees

An angle that measures greater than 90 degrees

Lines that intersect forming 2 acute and 2 obtuse angles

Lines that form 4 right angles

Lines that never touch or intersect

Lines that are next to each other

Lines that intersect forming 2 acute and 2 obtuse angles.

Lines that intersect and form 4 right angles.

Lines that never touch or intersect.

Lines that run horizontally.

parallel lines

intersecting lines

perpendicular lines

straight lines

intersecting lines

parallel lines

perpendicular lines

straight lines

rounded figure

flat figure

made of straight lines

open

closed

pentagon

quadrilateral

octagon

triangle

parallel lines

perpendicular lines

concurrent lines

skew lines

parallel

perpendicular

skew

concurrent

opposite sides are parallel

opposite sides are congruent

opposite sides are similar

One pair of congruent sides

one pair of equal sides

one pair of parallel sides

one pair of opposite sides