Proportion: 2 ratios equal to eachother.
a:b=c:d "a is to b as c is to d."
Extended Proportion: 1/3=3/9=15/45; more than 2 ratios(3 or more). Reduced fraction= Similarity Ratio.
Properties of Proportion: a/b=c/d (USE!!!)
1. means-extremes property
cross-product
cross multiply(ad=bc)ad are the extremes, bc are the means.
2. b/a=d/c
3. a/c=b/d
4. a+b/b=c+d/d
Are the polygons similar? If so, write a similarity ratio.
(~) Similar: Angles are congruent, sides are proprtional.
Example: 10:5=12:6=14:7
10/5=12/6=15/7
2=2=2.
therefore, yes, the polygons would be similar.
If x/y=5/8, is the following true or false?
8x=5y (true)