LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY
Geometry set. Plastic instruments used for geometry and technical drawing. Protractors (two at right and one at top left) are used to measure angles. Set squares (one at bottom left) are used to draw fixed angles. Graduated markings, such as on the ruler (bottom right), are used to measure distance. A compass (centre left) is used to draw circles, and can also be used to construct angles.
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