Scale Model in Geometry

Scale Drawings

Blueprints, models, etc

Objectives:

• Students use a scale to find missing lengths

• Students will use a scale to find the area of models and actual items

What is a scale?

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Fill in the Blanks

In Pete’s blueprint the length of a side wall is 16 inches. Find the actual length of the wall if the scale is 4in:3ft?

Multiple Choice

A room in a house is shown on a blueprint. The blueprint has a scale of 5 inches: 8 feet. A wall in the same blueprint is 30 inches. What is the actual length of the wall?

• 48 feet

• 24 feet

• 32 feet

• 64 feet

• 40 feet

Multiple Choice

On a map, the distance between 2 cities is 2.5 inches. The map scale is 1in:30 miles. What is the actual distance between the cities?

• 70 miles

• 30 miles

• 65 miles

• 2.5 miles

• 25 miles

Multiple Choice

A wall in a blueprint is 5 inches. The same wall has an actual length of 12 feet. What is the scale factor of the drawing?

• $$\frac{5}{12}$$  

• $$\frac{12}{5}$$  

• $$\frac{3}{4}$$  

• $$\frac{4}{3}$$