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Main Idea (paragraph)
It is usually in the first or last sentence of the paragraph.
Perimeter
Distance around an object / add all the sides
Simple Interest
P(money) R(%) T(years)
Percent Change
(Original - new) / original
Percent Increase / Decrease
X2 - X1 / original
Percentage
what interest me / total
Time
distance / velocity
Distance
Velocity • time
Velocity
Distance / time
Slope
y2 - y1 / x2 - x1
Volume of a cylinder
πr²h
Volume of a cube
L • w • h
Cathetus = leg
√hyp² - leg²
Hypotenuse
√Leg² + leg²
Circumstances
2πr
Circumstances of a Area
πr²
Area of a Trapezoid
(b1 + b2)h / 2
Area of a Triangle
b•h / 2
Area of a rectangle
L • w