Similar Shapes & Scale Drawings

Similar Shapes & Scale Drawings

EQ: How can you use scale drawings to solve problems?

Page 19

Poll

Did you watch the lesson video prior to class?

• Yes.

• No.

Poll

Have you picked up your notes yet? (Or printed them yourself)

• Yes.

• No.

Using Scales to Find Length, Width, and Area.

Use the first half of your notes on Page 19.

If you still need to pick up your notes from the office, please do that ASAP so you have the notes to work with!

Multiple Select

What ways can you write a ratio?

• Fraction

• Colon

• Equal Sign

• To

Multiple Choice

What method should you use to solve scale drawing problems?

• Percent Change Equation

• Proportions

• One-Step Equations

• Two-Step Equations

Fill in the Blanks

Use proportions to solve:

 $\frac{2}{5}=\frac{27}{x}$  

**Attention** LONG Question Up Next!

You will need to use your notes, and do this problem in multiple steps. (Seriously, follow the steps in the notes!!)

Fill in the Blanks

An art class is planning to paint a mural on an outside wall. They must submit a blueprint to the principal before they can begin painting. The blueprint measures 7 in x 19 in. If the blueprint uses a scale of 1 in: 3 ft, what is the AREA of the real mural?

Drawing in Different Scales

Take a look at the second half of your notes on Page 19

Multiple Choice

When determining if your new drawing will be bigger/smaller, if you end up with a fraction that is less than one, your drawing will be ________.

• Bigger than the original.

• Smaller than the original.

• Roughly the same size as the original.

Multiple Choice

Which is the correct way to determine the change in scales?

• Divide new ratio by old ratio.

• Divide old ratio by new ratio.

• Multiply new ratio by old ratio.

• Multiply old ratio by new ratio.

Multiple Choice

If you have an original scale of 1 cm: 5 m and a new scale of 2 cm: 5 m, will your new drawing be bigger or smaller than the original?

• Smaller (fraction = 1/2)

• Bigger (fraction = 2/1)

Do you have questions?

Yes? Ask your question on the next slide.

No? On the next slide tell me what you think is the most confusing thing about this new material (if not for you, maybe for others).

You may NOT just say "nothing" or that you get it.

Open Ended

Ask your question(s).

Tell me what you think is the most confusing about this material.

Assignment:

Week 10 Accelerated (HMH) Problems #1-5

If you haven't watched the video yet . . . . you should do that.