Geometry Flashcards
P=2a +2b
Or
P=2(a+b)
Perimeter of a parallelogram
A=1/2 bh
Area of a triangle
A=Bh
Parallelograms area
A=1/2(B1 + B2)
Area of a trapezoid
A= 1/2(d1) (d2)
Area of a kite
F O I L
First, out, inner, last
45-45-90° triangle theorem
Hypotenuse = leg • \/2
30-60-90° triangle theorem
Hypotenuse= short leg • 2
Long leg= short leg • \/3
Short= X
A= 1/2 ap
Apothem x diameter
Area of a regular polygon
Circumference
C=pi•d
Or
2pi•r
Arc length measure
L= m AB
——— • 2pi • r
360°
Euler’s formula
Vertices + faces - edges = 2
Area of a circle
Pi•r2(squared)
Surface area of a prism
And lateral area
LA= perimeter of base • height
SA= LA +2B
B=area of base
LA of a cylinder
2pi •r•h
Or
Pi•d•h
V=pi•r2(squared)h
Volume of a cylinder
Volume of a sphere
V= 4/3pi•r2(squared)
Area of a pyramid
A= 1/3 Bh
B=area of the base
Area of a cone
1/3 pi•r2(squared)h
V= pi•r2(squared)h
Volume of a cylinder
d= \/(x-x)2 + (y-y)2
Distance formula
(x-h)2 + (y-k)2 = r2
H= center
K= center
R= radius
Equation of a circle
Trapezoid midsection theorem:
Mid point of a trapezoid = mean of the bases
