Math Plane Geometry
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:represented by a dot
point

:a group of points having to endpoints
line segment

:describes segments or angles of the same length, shape or size
congruent ≃

:a group of points having no endpoints
line
(A line extends indefinitely in two opposite directions.)

:a group of points having one endpoint
ray
(A ray extends indefinitely in one direction.)

:two rays that share a common endpoint
angle

: a common endpoint where two rays or sides of a polygon meet, usually labled with capital letters
vertex

: a 90 degree angle with a square corner
right angle

:lines that cross each other at some point
intersecting lines

:intersecting lines that form four right angles
perpendicular lines

:lines that never intersect
parallel lines

:does not have a point of intersection
simple closed shape

symbol :have the same shape but not the same size
similar shapes ˜

:simple closed shape made up of line segments
polygon

:a three sided polygon
triangle

:a foursided polygon
quadrilateral

:a quadrilateral having opposite sides that are parallel
parallelogram

: a parallelogram having four right angles
rectangle

: a rectangle having four congruent sides
square

: a parallelogram having four congruent sides
rhombus

:a quadrilateral having only one set of opposite sides that are parallel
trapezoid

:a five sided polygon
pentagon

:a sixsided polygon
hexagon

:a sevensided polygon
heptagon

:an eightsided polygon
octagon

Formula Perimeter Rectangle/parallelogram
P = 2l + 2w

Formula Perimeter square
P = 4s

Formula Perimeter Triangle
P = a + b + c

Formula Area Rectangle
A = bh

1 square foot (sq. ft.) = sq. in.
144 sq. in.

1 acre (a.) = sq. ft.
43,560 sq. ft.

1 square Yard (sq. yd.) = sq. ft.
9 sq. ft.

1 square mile (sq. mi.) = acres
640 acres


Area of Parallelogram
A = bh

Area of Triangle
 A = b h
 2
 1/2 x base x height



Formula sides of right triangle
^{}

Acute Angle
Less than 90^{o}

Angle that measures more than 90^{o}
obtuse angle

angle that measures 180^{o}
straight angle

triangle that has two congruent sides and two congruent angles
isosceles triangle

triangle that has three congruent sides and angles
equilateral triangle

Name of an instrument that is used to measure the number of degrees in an angle.
protractor

Half of a circle is called a?
How many degrees is it?

The line segment that goes through the center of a circle and has both endpoints on the circle?
diameter

The length of a straight line drawn from the center to a point on a circle?
radius

Degrees in a circle?
360^{o}

Formulas for circumference of a circle?

=

Formula for area of a circle?

Formula area of regular polygon