accessory
background
centimetre
closeup
color
colorful
construction
different
distance
education
engineering
equipment
flat
geometric
geometry
instrument
isolated
knowledge
lay
learn
length
many
math
mathematics
measure
measurement
measuring
meter
modern
nobody
object
office
pattern
plastic
ruler
rulers
school
size
stationery
straight
student
study
subject
supplies
task
tool
top
triangle
view
white