WGU_QL_Formulas.txt

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 Author: ghstechnology ID: 82467 Filename: WGU_QL_Formulas.txt Updated: 2011-04-28 08:36:51 Tags: math Folders: Description: math Show Answers:

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1. Measure of angles for triangle and Polygons
• Sum of the three angles for a triangle is
• Area review
• Squared units
• rectangles
• A=L*W
• Squares
• A=s2
• Paraellogram
• A=b*h
• Triangles
• A=1/2*b*h
• Trapezoids
• A=1/2*h*(a+b)
2. Circles

3. Volume and Surface area
4. Factoring

6. Sequences
• Arithmetic
• Found by adding a common number to the first term and then to the second term etc. Find this common
• term by subtracting a 2nd number from 1st etc. Be sure to spot the pattern.

• To find the Nth term
• – use a formula

• Where
• a1 = first term of sequence
• an = the term you wish to find
• d= common difference
• n – place position of the
• term IE Find term 20 – n = 20

an= a1 + d(n-1)

Geometric Sequences

• Found by multiplying a common number from 1 term to the next. For example multiplying 3 by the first term and then multiplying 3 by the
• first number etc. Find the common ratio by problem solving and spotting the pattern.

Can do this by dividing the 2nd term by the first term – this is called the common ratio. Can use decimals or fractions.

• To find the Nth term – use a formula
• Use exponents ( r = common ratio)

an = a1 x r n-1

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