Ratios and Geometry

In my fish tank, the ratio of red fish to blue fish is 3:5. There are 20 blue fish. How many red fish are there?

• 18

• 12

• 4

• 15

Review the picture.  Find the missing side measurement in the picture using a proportion.

• w = 18 m

• w = 6 m

• 6 m

• w = 0.16 m

The figures are similar. Find the scale factor of the smaller figure to the larger figure.

• 2:5

• 5:3

• 3:5

• 2:3

Solve the proportion.

• p=31.3

• p=308

• p=924

• p=532

What is a Ratio?

• It's a comparison of two things

• Multiplying two fractions 

• A number over another number

• Two decimals that can be multiplied

A class has 15 boys and 20 girls. What is the boy:girl ratio in simplest form?

• 4 : 5

• 10 : 13

• 3:4

• 3:5

The pair of figures is similar. Find the missing side.

• x = 1

• x = 3

• x = 9

• x = 5

Are the triangles similar?

• Yes

• No

What is the similarity statement for the triangle pair?

• ΔXYZ~ΔNEW

• ΔXZY~ΔNWE

• ΔZYX~ΔENW

• ΔYZX~ΔNWE

If ABCDE ∼ GHJDF, then∠B is congruent to _______

• ∠H

• ∠D

• ∠F

• ∠J