Reading an angle
Line up one arm with zero, then read where the other arm crosses the scale.
Interactive Protractor
Measure and draw angles with a draggable interactive protractor.
Adjust the angle
Drag the orange arm with the slider, jump to a benchmark angle, and compare how acute, right, and obtuse turns look on the same protractor.
Current angle: 60°
Acute angle
0° – 180°
Quick reference
Mini lesson
Use the protractor to explore acute, right, obtuse, and reflex angles.
Comparing angle types
Try 45°, 90°, and 135° to see how angle size changes visually.
Explore further
Try these next
#1
Acute angle
Make an angle smaller than 90 degrees.
#2
Right angle
Adjust the arm until the angle is exactly 90 degrees.
#3
Obtuse angle
Create an angle between 90 and 180 degrees.
Keep going