2d
angled
axiom
background
balance
black
blackboard
board
cathetus
chalk
chalkboard
chart
composition
design
diagram
drawing
education
educational
figure
formula
fundamental
geometry
graphic
hypotenuse
knowledge
learn
lesson
line
math
mathematics
measure
pattern
plan
planimetry
proportion
proposition
pythagoras
pythagorean
room
root
school
seminar
square
texture
textured
theorem
triangle
trigon
trigonometry