How did ancient peoples determine the height of really tall objects? Young scientists and mathematicians explore the concept of using shadows to measure height in a hands-on experiment. Paired pupils measure shadows, then calculate the height of the object using similar triangles.

Concepts

shadows, indirect measurement, hypotenuse, making observations

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Additional Tags

math

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Instructional Ideas

• Work the science angle by having class members form a hypothesis regarding why this measurement method is accurate
• Assign research on the topic of ancient forms of measurement and measurement devices

Classroom Considerations

• The activity works best when performed outdoors
• Locate enough yard sticks for each working pair

Pros

• The activity is very streamlined and keeps learners focused on the objectives of the lesson
• Makes a good exercise for classes studying the solar eclipse, as shadows are useful tools for eclipse observation

Cons

• None