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Geometry Guide
Lines planes pointsangles
Point
A dot with a letter
s
Lines
A line that goes on for ever
fs
Line Segment
A straight line
s
m
Ray
One line that goes on for ever
fd
Plane
A flat end that extends
s
d
a
Intersecting
Two lines that cross
Perpendicular
A right angle 90 degrees
Parallel
Two lines that don't cross
Skew
Lanes that are not in the same plane
Acute
A 50 degree angle
Obtuse
A 180 degree angle
Vertex/ Vertice
The middle point
Right
A 90 degree angle
Straight
A straight angle that equals thats 180 degrees
Complementary
If the measure is 90 degree
15
75
Supplementary
If the measure is 180 degrees
100
80
Vertical/ Opposite
Are opposite two lines interesect
r
m
n
p
q
adjacent
Side by side common vertex and ray
s
t
w
d
f
Triangles
ObtuseAcuteRightEquilateralIsoscelesScalene
Obtuse Triangle
The greatest angle is the obtuse that equals 180
Acute Triangle
The greatest angle is an acute angle that equals 180
Right Triangle
The greatest angle is a right angle that equals 180
Equilateral triangle
3 congruent sides
Isosceles Triangle
At least 2 congruent sides
Scalene Triangle
No congruent sides
Perimeter
Add all the sides up
5
5
15
5+5+15=25
Sum of Internal Angles
The sides and the triangles
4 sides and 2 triangles
2 x 180 = 360
Area
Time the base and height
10
20
15
Quadrilaterals
Trapezoid ParallelogramRectangleRhombusSquare
Quadrilateral
A box that makes 4 right angles
Trapezoid
2 set of parallel line
Parallelogram
4 connected sides
Rectangle
Four right angles
Rhombus
Four congruent sides
Square
Congruent sides
Area of a Rectangle
Times the outside then divided by two
25
10
Area of a Square
The outside is times then divided
6
8
Area of a Parallelogram
Times and then divided
Area of a Trapezoid
The outsides are times then divided
9
Circles
Chord diameter sectorradius
Chord
Where you draw a line at the top
Diameter
The middle part of a circle
Arc
A part of a circle named by two rays with common endpoints.
a
b
Radius
The outside of the circle
radius
Sector
A region enclosed by two radii
Circumference
The distance around a circle
6m.
Area of circle
The outside of a circle
Other Polygons
Pentagonhexagonoctangon
Pentagon
It has 5 sides
Hexagon
All sides are congruent
Octogon
It has six sides
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