Careful Words
perpendicular
(n.)
axis
beeline
chord
diagonal
diameter
edge
normal
plumb
radius
secant
segment
shortcut
side
steep
straight
straightaway
tangent
upright
vector
vertical
perpendicular
(adj.)
diagonal
edge
erect
normal
orthogonal
plumb
precipitous
rectangular
right-angled
sheer
side
stand-up
steep
straight
straightaway
transversal
upright
vertical
by
simon sarris
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