Important Geometry Words

An angle that measures more than 0º and less than 90º is called an __________ __________.

• obtuse angle

• acute angle

• straight angle

• right angle

An angle that measures more than 90º and less than 180º is called an __________ __________.

• acute angle

• right angle

• straight angle

• obtuse angle

Angles that have a common side and a common vertex or corner point are called __________ __________.

• adjacent angles

• side-by-side angles

• opposite angles

• lazy angles

A __________ angle measures 90 degrees.

• obtuse

• adjacent

• right

• acute

Two or more lines that never intersect or meet are called __________ __________.

• perpendicular lines

• parallel lines

• straight lines

• sidelines

Horizontal and vertical lines that intersect at a 90 ° angle are called __________ __________.

• parallel lines

• intersecting lines

• perpendicular lines

• cross lines

Objects that are the same size and same shape are called __________.

• vertex

• intersecting

• contagious

• congruent

__________ occurs when a figure has the same shape, size, and position on both sides of a dividing line.

• Coincidence

• Same

• Symmetry

• Intersecting

A point where two or more straight lines meet is called the __________.

• vertex

• vortex

• parallel

• perpendicular

Lines that cross at one point are called __________ _________.

• cross lines

• intersecting lines

• straight lines

• plain lines