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41 Cards in this Set
 Front
 Back
Angles of a right Triangle with one leg half the hypotenuse?

30  90  60


Reciprocal of a?

1/a


Product of any number and its reciprocal?

1


(b^m)(b^n)

b^m+n


(b^m)/(b^n)

b^mn


(b^m)^n

b^mn


(b^m)(c^m)

(bc)^m


11^2

121


12^2

144


13^2

169


14^2

196


15^2

225


16^2

256


Cross Multiply
1/3 ? 3/8 
Since 8 < 9
1/3 < 3/8 

Cross Multiply
3/8 ? 45/120 
8 * 45 = 3 * 120
so 3/8 = 45/120 

20 / (2/3) = ?

20 * 3/2 = 30
To divide multiply by reciprocal 

Deviation

difference from the average


(x  y)(x + y)

x^2  y^2


(x  y)^2

(x^2)  2xy + y^2


(x + y)^2

(x^2) + 2xy + y^2


Sides with the same length are opposite __________ angles

equal


a^2 + b^2 = c^2 if

triangle is a right triangle


a^2 + b^2 < c^2 if

if triangle is obtuse


a^2 + b^2 > c^2 if

if triangle is acute


Right Triangle for positive number x

3x, 4x, 5x


5, 12, ?

13 ... must know triangle


In 45 45 90 triangle sides = ?

x, x , x^1/2 = sqrt(x)


In 30 90 60 triangle

x = little
2x = hypotenuse x*(sqrt3) = long 

In non right triangle the sum of 2 sides is _________ than the other

always greater


In non right triangle the difference of 2 sides is _________ than the other

always less


Area of triangle?

1/2 * bh


Area of equilateral triangle?

((s^2)*sqrt3)/4


Sum of n angles in polygon of n sides?

(n  2) * 180


Area of parallelogram?

A = bh


Area of square by diagonal

A = 0.5 d^2


Area of trapezoid?

A = 0.5 (base1 + base 2)height


Circumference?

2piR


Arc length of angle x?

(x/360)(2piR)


Area of sector fromed by arc with angle x?

(x/360)(piR^2)


Area of cube?

A = 6e^2


Slope =

(y2  y1)/(x2  x1)
rise over run 