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Measure of angles for triangle and Polygons
 Sum of the three angles for a triangle is <A + <B+ <C = 180
 Polygons
 Where n is the number of sides
 (n2)*180

Perimeter
 Polygon  add up the length of all sides
 Rectangle = 2(L+W)
 Square = P = 4*s

Area review
Squared units
 rectangles
 A=L*W
 Squares
 A=s^{2}
 Paraellogram
 A=b*h
 Triangles
 A=1/2*b*h
 Trapezoids
 A=1/2*h*(a+b)





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
 a_{1} = first term of sequence
 a_{n} = the term you wish to find
 d= common difference
 n – place position of the
 term IE Find term 20 – n = 20
a_{n}= a_{1} + d(n1)
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)
a _{n }= a _{1} x r ^{n1}

