Geometry- formulas
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20 Terms
1
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Area of a circle
A= πr2
2
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circumference of a circle
C = 2πr
3
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Area of square
A= s2
4
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Perimeter of a square
P = 4s
5
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Area of Trapezoid
A = 1/2h(b1 + b2)
6
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Area of a rectangle
A= lw
7
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Area of a parallelogram
A = bh
8
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Area of a triangle
A = 1/2bh
9
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Pythagorean thm and what its used for
a2+b2=C2 (for sides of right triangle)
10
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Distance formula
d=√(x2-x1)2+(y2-y1)2
11
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Midpoint formula
(x1+x2/2 , y1+y2/2)
12
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permutations
Order matters
13
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Combination
order doesn't matter
14
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sum of exterior angle
360 for all
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one exterior angle
360/n
n=number of sides
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sum of interior angles
180(n-2)
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One interior angle
180(n-2)/n
18
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converse logic
switch
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inverse logic
negate both
20
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comntropositive
switch & negate
(logically equivalent)
Note 
Flashcards (109)