protractor
Degrees on plastic
A protractor is a semicircular or circular tool marked with degrees, used for measuring and drawing angles.
Standard in geometry classes and drafting, it typically spans 180 degrees in a half-circle shape: Use the protractor to measure the angle between these two lines.
Geometric measure of rotation
- degreesUnits of measurement
- arcCurved line segment
- semicircleHalf a ring
- measurementDetermining size or amount
vertex · acute · obtuse · right · bisector · radians · complementary · supplementary
Device showing cardinal directions
- rulerOne who governs
- straightedgeLine-drawing tool
- T-squareRight-angled drawing guide
- set squareTool for drawing angles
triangle ruler · calipers · divider · French curve · stencil · graph paper · geometry set · measuring instruments
Detailed technical drawing
- schematicSimplified technical diagram
- diagramSimplified explanatory sketch
- sketchHasty informal drawing
- technical drawingPrecise specification illustration
layout · template · scale · CAD · architect · engineer · draftsman · tracing
Educational instruction space
- teacherOne who instructs others
- studentsThose receiving instruction
- mathematicsScience of quantity and structure
- homeworkStudent assignments for outside class
textbook · worksheet · chalkboard · whiteboard · curriculum · learning · math class · instruction
angle
Geometric measure of rotation
- degreesUnits of measurement
- arcCurved line segment
- semicircleHalf a ring
measurement · vertex · acute · obtuse · right · bisector · radians · complementary · supplementary · perpendicular
compass
Device showing cardinal directions
- rulerOne who governs
- straightedgeLine-drawing tool
- T-squareRight-angled drawing guide
set square · triangle ruler · calipers · divider · French curve · stencil · graph paper · geometry set · measuring instruments
blueprint
Detailed technical drawing
- schematicSimplified technical diagram
- diagramSimplified explanatory sketch
- sketchHasty informal drawing
technical drawing · layout · template · scale · CAD · architect · engineer · draftsman · tracing · rendering
classroom
Educational instruction space
- teacherOne who instructs others
- studentsThose receiving instruction
- mathematicsScience of quantity and structure
homework · textbook · worksheet · chalkboard · whiteboard · curriculum · learning · math class · instruction · demonstration
- math toolscalculator, abacus, graphing calculator, scientific calculator, straightedge
- drafting toolscompass, T-square, triangle, ruler, drafting table
- engineering toolstheodolite, level, transit, tape measure, caliper
- physics labpendulum, circuit, magnet, inclined plane, pulley
- plotting toolsgraph paper, ruler, compass, spreadsheet, Excel
- school suppliespencils, pens, erasers, pencil, notebooks
protractorruler
One who governs
straightedge · tape measure · yardstick · meterstick · measuring tape
protracted, protract, protraction, protracts, protractors, protracting