Understanding Scale Drawings and Scale Factors

Mrs. Zapia's lesson focuses on computing actual lengths from scale drawings. Students learn to calculate scale factors and apply them to find dimensions in scale drawings. The lesson includes examples and exercises involving boats, paths, and race cars, emphasizing the importance of identifying original and scale drawings, measuring corresponding segments, and using scale factors to determine new dimensions.

What is the main focus of lesson 14?

• Understanding scale drawings

• Learning about fractions

• Exploring geometric shapes

• Studying algebraic equations

How can you determine the scale factor when no measurements are given?

• By using a ruler

• By guessing the size

• By measuring the angles

• By understanding the relationship between the original and scale drawing

In Example 1, what is the perimeter of the original small boat?

• 32.5 units

• 28.4 units

• 30 units

• 25 units

What is the formula to calculate the scale factor?

• Scale drawing length plus original length

• Original length times scale drawing length

• Scale drawing length divided by original length times 100

• Original length divided by scale drawing length

In Exercise 1, what is the length of the longer path?

• 30 units

• 28.4 units

• 35 units

• 32.4 units

What is the scale factor used in Example 3 for the race cars?

• 275%

• 325%

• 165%

• 100%

In Exercise 2, what is the scale factor calculated for the vertical heights?

• 165%

• 275%

• 100%

• 325%

What does a scale factor greater than 100% indicate?

• No change

• An enlargement

• A reduction

• A decrease