Trigonometry: measuring with triangles

Learning Material, Learning Guide, Learning Module  |  Interactive Lesson  |  RAR

Published on 2018 August 1st

Compare the shadows cast by a small stick and a larger object such as a column of a Greek building. Check the angles at which the shadows are cast and confirm whether the two objects create similar triangles. Use equivalent ratios to calculate the lengths of triangles' sides: height of an object or the length of a shadow. Explore how right-angle triangles can be used in measurement, including special properties of the isosceles right-angle triangle. This learning object is one in a series of ten objects.
1. Students apply knowledge of relationships between sides of similar triangles to calculate side lengths in right-angle triangles.
2. Students use multiplicative and ratio strategies to solve measurement problems.

Curriculum Information

K to 12
Grade 1, Grade 2, Grade 7, Grade 8, Grade 4, Grade 3, Grade 9, Grade 5, Grade 6, Grade 10
Numbers and Number Sense Geometry Patterns and algebra Measurement Patterns and Algebra
Learners, Students

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Education Services Australia
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