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Math A Review

Ratio and Proportions

Ratio Sum Problems:
    1.    Write the ratio as an algebraic ratio.  ex.    Find the two numbers in the ratio 4:5 whose sum is 18.    4x:5x
    2.    Set up equation and solve.                          4x + 5x = 18        9x = 18    x = 2
    3.    Find each value by substituting back into the algebraic ratio    4x=4(2)=8 and 5x=5(2) = 10
Solving Proportions:    Product of Means equals Product of the extremes
 
Direct Variation
    1) Write the ratio to compare
    2) Set up equal ratios
    3) Solve proportion
Percents
 
Similar Triangles
 
Ratio of Sides equals the Ratio of the perimeters.
Ratio of Areas equals the Ratio of the sides squared.
Right Triangle Proportions