unit 1 day 5

unit 1 day 5 similar figures What are they and finding missing lengths

http://www.youtube.com/watch?v=1UuiF3mskQA



If two objects have the same shape, they are called "similar." When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if the triangles shown are similar, compare their corresponding sides. Are these ratios equal?

Quiz 

1 there are two similar triangle  one is 15 tall and 20 long the other is 10 tall and (x)

2 20x 25 15 x (x)

3 30 x 15 20 x (x) 

Answer

1 15/ 20 is to 10/x cross multiply 15x/15= 200/ 15 then divide to get 13.3  

2 18.75

3 10