Description: 【Chart Drawing Triangle Ruler for Drawing 】Determine on triangle angle protractor to decide course. 【Feature】When making chart, triangle ruler used drawing the bearing or heading line, and measure the bearing or heading line degree. 【Triangle Ruler】This triangle ruler protractor with scientific design, convenient using. 【High Quality】The triangle ruler tool is made of Acrylic material, durable, lightweight and comfortable to use. 【Easy Reading】The triangle ruler with and clear printed ruler scales, easy to read. The right angle ruler is a convenient measuring tool for architects, engineers, designers, artists, teachers, etc. Specification: Material: Acrylic Color: Clear Size: Isosceles Right Angle Ruler: Hypotenuse Length 34cm/13.39inch Right Angle Length 24cm/9.45inch Right Angle Ruler: Long Right Angle 35cm/13.78inch Short Angle Length 20cm/7.87inch Package Includes: 2 Triangle Ruler