Geometry Vocabulary Practice
An endless supply of never-repeating vocabulary problems: name lines, rays, segments and planes from diagrams, classify angles by measure, and read a protractor without falling for the wrong-scale trap.
1 Practice
Type your answer and press Check answer (or Enter). A wrong answer earns a hint first; a second miss walks you through the full solution.
How to enter answers
- Figures: type
point,line,ray,segment, orplane. - Names: type the name with a space, e.g.
ray AB(the endpoint comes first for rays). - Angles: type
acute,right,obtuse, orstraight. - Measures: type the number of degrees, e.g.
60.
2 What you’ll practice
Every problem is generated fresh from 6 templates — a problem never repeats until its whole pool is used up.
Name the figure
Look at the arrowheads (or their absence) and decide: line, ray, or segment? Then write the name in correct notation order.
Classify the angle
Given a degree measure, place the angle in its family: acute, right, obtuse, or straight.
Read the protractor
Start at 0° on the side the angle opens from — never the other scale.
3 Watch out for these
The two mistakes students make most often with geometry vocabulary.
Wrong: “it has points A and B on it, so it’s a segment.” Right: the arrows decide — both-ends arrows mean a line.
Wrong: reading 120° for an angle that opens from the left. Right: start at 0° on the side the angle opens from; sanity-check acute vs. obtuse.