Math Vocabulary - Chapter 7

point : a location that has no size and is named by a capital letter

line : a series of points that extend in opposite directions without an end named with a lowercase letter

parallel lines : lines in the same planes that never intersect

skew lines : lie in different planes and are not parallel or intersecting

strait angle : An angle that measures exactly 180 degrees

complementary angle : Two angles whose sum is 90 degrees

congruent sides : sides that have the same length.

scalene triangle : A triangle with no congruent sides

obtuse triangle : A triangle where one angle measures over 90 degrees.

polygon : A closed plane figure with sides formed by three or more line segments and the sides only meet at their endpoints. You classify polygons by their number of sides.

decagon : a polygon with 10 sides

regular polygon : a polygon with all sides congruent and all angles congruent

rectangle : a parallelogram with four right angles

square : a parallelogram with four right angles and four congruent sides

diameter : a segment that passes through the center of a circle and has both endpoints on the circle

central angle : an angle with its vertex at the center of a circle

angle : a figure formed by two rays with a common endpoint