Key Features :
i : USEFUL MEASUREMENT RESOURCE -- Measure and construct all types of angles, triangles and geometric shapes with this transparent ruler. It measures angles up to 360 degrees and lengths of up to 12" or 30cm.ii : PINPOINT ACCURACY -- Measure angles to the nearest degree or to the nearest 5 degrees using the black markings around the circular pivot.iii : EASY TO MARK ANGLES -- 20 evenly spaced holes 0.5" apart enable students to mark angles without moving the ruler off the page.iv : CLEAR PLASTIC -- The flexible, transparent plastic enables users to view through the angle measurement ruler and easily measure and draw angles and lines.v : DRAW STRAIGHT LINES -- Open the angle measurement ruler to draw straight lines up to 12" or 30cm long. It lays flat on the page when open.vi : STRONG AND DURABLE -- The ruler is made of flexible plastic, which is shatter resistant, and will last for years of use.