- acute
- angle
- attribute
- base
- cone
- congruent
- curved surface
- edges
- equilateral triangle
- face
- hexagon
- isosceles triangle
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- obtuse
- octagon
- one-dimensional figure
- parallel
- parallelogram
- pentagon
- perpendicular
- plane
- polygon
- prism
- pyramid
- quadrilateral
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- rectangle
- right
- scalene triangle
- side
- sphere
- square
- symmetry
- three-dimensional figure
- trapezoid
- triangle
- two-dimensional figure
- vertex
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