Geometry ratios,proportions and similarity

What is a Ratio?

• A comparison of two quantities 
• To multiply two fractions 
• A number over another number
• Two decimals that can be multiplied

A proportion is a

• ratio statement

• an "if-then" statement

• a statement of 2 ratios that are equal to each other

• a comparison

What is the ratio of red apples to green apples

• 7 apples to 3 green

• 4 red apples to 7 apples

• 4 red apples to 3 green apples

• 3 green apples to 4 red apples

Solve the proportion.

• k=5
• k=3.3333333
• k=60
• k=90

Solve for x

• x = 1/6

• x = 7

• x = 6

• x = 9

Mathematical Equivalence

ON

Complete each proportion.
AB / BM  =  ? / CD

• BC
• AC
• MD
• MC

Find missing side

• 5
• 7
• 9
• 11