Advanced Math Geometry Vocab

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right angle

an angle that measures exactly 90 degrees

straight angle

an angle that measures exactly 180 degrees

congruent angles

angles that are equal in measure

parallel lines

two lines that remain equal distance from each other- they go on and one forever and never intersect

perpendicular lines

two lines that intersect and when they do, they form right angles

acute angle

an angle that measures LESS than 90 degrees

obtuse angle

an angle that measures MORE than 90 degrees and LESS than 180 degrees

polygon

A closed figure formed by three or more line segments

quadrilateral

a 4-sided polygon

rectangle

A parallelogram with four right angles

Parallelogram

A quadrilateral with two pairs of parallel sides

square

A quadrilateral with 4 sides that are equal and has all 90 degree angles

Rhombus

A parallelogram with four congruent sides

Trapezoid

A quadrilateral with exactly one pair of parallel sides

equilateral triangle

A triangle with three congruent sides

isosceles triangle

A triangle that has 2 equal sides.

scalene triangle

a triangle with no congruent sides

regular polygon

a polygon with all sides and all angles equal

perimeter

the distance around a polygon

area

The number of square units required to cover a surface- the "inside"

congruent

Having the same measure

formula

(mathematics) a standard procedure for solving a class of mathematical problems

net

a set of 2-d shapes that when put together form a 3-d figure.

volume

Amount of space occupied by an object

surface area

The sum of all the areas of all the faces or surfaces that enclose a solid.

Prism

A solid geometric figure whose two ends are similar, equal, and parallel figures, and whose sides are parallelograms.

pyramid

A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)

vertex

A corner point where two or more straight lines, edges and faces

face

A flat surface of a polyhedron

edge

A line segment where two faces intersect

point

a location in space that has no size

line

a straight one-dimensional figure that extends indefinitely in both directions

plane

a flat surface that has no thickness and extends forever

ray

A part of a line, with one endpoint, that continues without end in one direction

line segment

A part of a line between two endpoints.

complementary angles

Angles that add up to 90 degrees

supplementary angles

two angles whose measures have a sum of 180 degrees

angle

A figure formed by two rays with a common endpoint

acute triangle

A triangle that contains only angles that are less than 90 degrees.

obtuse triangle

A triangle with one angle that is greater than 90 degrees.

vertical angles

A pair of opposite congruent angles formed by intersecting lines

adjacent angles

Angles that have a common side and a common vertex (corner point).

right triangle

A triangle that has a 90 degree angle.

pentagon

a polygon with 5 sides

hexagon

a polygon with 6 sides

octagon

a polygon with 8 sides

triangular prism

a 3-d shape that has three rectangular sides and two triangular bases

square-based pyramid

a 3-d figure with a square base and four sides that are triangles that meet at a common vertex

rectangular prism

a 3-d shape that has 6 faces that are three pairs of congruent rectangles

cube

A regular solid having six congruent square faces.

triangle-based pyramid

3 triangles + 1 triangle on the bottom