Actual Lengths and Areas from Scale Drawings
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Objective
I can compute actual lengths and areas from a scale drawing.
Part 1 of 4
Warm-up video
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We don't generate video — this one is by Khan Academy on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
A blueprint drawing is a scale drawing of something in the real world, such as a house.
- 2
If a scale shows that 10 cm on a blueprint represents 2 meters, then 18 cm on the blueprint would represent 3.6 meters in the real world.
- 3
To find the actual height of an object from a scale drawing, you can multiply the real-world measurement by the ratio of the drawing units to the actual units, as seen when 2 units representing 6 cm means 16 units represent 48 cm.
Part 3 of 4
Practice
11 questions
What is the primary purpose of a scale drawing, such as a blueprint or a map?
A model airplane is built with a scale where 1 inch on the model represents 4 feet in real life. If the wingspan of the model is 12 inches, what is the actual wingspan of the airplane in feet?
Part 4 of 4
Exit ticket
Quick comprehension check
“A blueprint of a park shows that 4 cm represents 8 meters in actual length. If a path on the blueprint is 15 cm long, what is the actual length of the path in meters? Show your work.”
Sample answer included in the free materials
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