MathsClass

A blog about teaching and learning in a maths classroom.

Constructing Triangles

Friday, 28 November 2014 | 0 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:

A scaffolded approach to constructing triangles.

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.

A scaffolded approach to constructing triangles.

Worksheet with answers is available for download on MathsFaculty:

Posted in • Lesson IdeaConstructionsMathsClassMathsFacultyPrintableWorksheet | Short URL: http://mths.co/3965

Comments

There are no comments for this entry yet.

Post a comment

Commenting is not available in this channel entry.

New  Subscribe to the …

MathsLinks
email newsletter

Get updates…



Twitter   Facebook   Pinterest

About

Simon Job — eleventh year of teaching maths in a public high school in Western Sydney, Australia.
MathsClass is about teaching and learning in a maths classroom. more→

Archive

by date

by category

Search

Elsewhere

@simonjob
updates via @mathslinks

Recently read/found.

View All | RSS