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Different objects such as a book, a set square, two stepping stools and an egg float around the main figure.
en.wikipedia.org The most simple form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed.
en.wikipedia.org It's a wonderful collection of set squares, planes, chisels, mallets, lathes, hand drills and measures.
www.smh.com.au Now using a set square and a pencil mark 90mm along the entire length of the two body pieces.
www.sunshinecoastdaily.com.au It includes a 15cm ruler, a 180-degree protractor, a 45-degree and 60-degree set square, a self-centring compass, a sharpener, eraser and pencil.
www.nzherald.co.nz