A blog about teaching and learning in a maths classroom.

Friday, 28 November 2014 | Comments

One of the challenges I had this week when students were constructing rectangles and squares using a ruler and set square (drafting triangle) was checking the accuracy of the measurements (sides and angles). I walked around with a ruler and set square checking their drawings.

Making a transparency that could be overlayed on their work for self-checking was one idea, but that would still rely on them checking accurately and wouldn't give me any information about how they were going.

For constructing triangles, I came up with this:

For each construction, an accurately drawn triangle should pass through a particular point. In this question (above), the scaffold is checking the angle size.

In the question below, angle size and side length are being checked.

Worksheet with answers is available for download on MathsFaculty:

Posted in • Lesson Idea • Constructions • MathsClass • MathsFaculty • Printable • Worksheet | Short URL: http://mths.co/3965

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**Simon Job** — eleventh year of teaching maths in a public high school in Western Sydney, Australia.

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