1.29.24 U3L12 Proportions

What is the correct order of steps to find the missing sides of SIMILAR triangles WITH PROPORTIONS?

Step 1 --> Step 2 --> Step 3

• Cross Multiply

• Set Up a Proportion

• Divide

Are the triangles similar?

• Yes
• No

The 2 shapes are similar. Solve for X.

• 2 ft

• 3 ft

• 4 ft

• 6 ft

The 2 shapes are similar. Find x.

• 2

• 7

• 0.5

• 12

Find side length X.

• 30
• 25
• 15
• 40

What proportion will help you solve for side YX?

(There are 2 correct answers!)

Solve for X.

• 2 ft
• 3 ft
• 4 ft
• 6 ft

What proportion will help you solve for x?

Which proportion will help you solve for the missing side?

Answer explanation

You need to seperate the two triangles into image (ABC) & pre-image(ADE).

BC is the missing side it matches DE = 11.

AC = 14 because 9+5 =14 and it matches to

How long is side BC?

Mathematical Equivalence

ON

Answer explanation