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GRE Math Basics
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Gravity
Key Concepts:
Terms in this set (38)
Circle Area Formula
A = πr²
Circle Circumference Formula
C=2πr
Pythagorean Theorem. c^2=
a^2 + b^2. When right triangle and "c" is the long side opposite of the 90 degree angle
Triangle Area Formula
A=1/2bh
Pythagorean triplet (right triangle side length). 3:4:X
3:4:5
Pythagorean triplet (right triangle side length). 5:12:X
5:12:13
Pythagorean triplet (right triangle side length). 8:15:X
8:15:17
Angles in a triangle add up to
180 degrees
Area of a trapezoid formula
A=1/2h(b1+b2)
x^0 =
1
(x^a)(x^b)
x^a+b
x^a/x^b =
x^(a-b) = 1/x^(b-a)
(x^a)(y^a) =
(xy)^a
(x/y)^a
x^a/y^a
(x^a)^b
=x^ab
sqrt(a) * sqrt(b)
sqrt(ab)
(sqrt(a)) / (sqrt(b))
sqrt(a/b)
even + even
= even
even + odd =
odd
even * even
even
odd+odd=
odd
odd*odd=
odd
even * odd =
even
Whole Number
Positive integers and zero
Integer
All whole numbers (both positive and negative) and zero.
Real Number
Includes decimals. All rational and irrational numbers
Rational Number
fractioned number
Irrational Number
Any real number which cant be expressed as a fraction of two integers
parallelagram area
A=b * h
No one side of a (this geometric shape) can be greater than the other two put together
triangle
T/F: you can combine square roots when adding. i.e. sqrt(a) + sqrt(b) = sqrt (a+b)
False. You can not combine when adding/subtracting. You can when multiplying.dividing
T/F: Do exponents distribute over sums and differences? i.e. does (a+b)^c = a^c + b^c
False. Exponents DON'T distribute over sums and differences:
T/F: you can combine square roots when adding. i.e. sqrt(a) + sqrt(b) = sqrt (a+b)
False. You can combine when adding/subtracting. You can when multiplying.dividing
How do you calculate the percentage of a weird number if you don't have a calculator?
Cross multiply. i.e.25% of 62 can be calculated through 25/100= n/62
Probability of two independent events happening
multiply probabilities
distance =
rate x time
smile
because you are awesome
Area of a hexagon
( 3S^2 sqrt3 ) / 2 where s is the side length
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