decagon
Ten-angled shape
A decagon is a polygon with ten sides and ten angles.
The term appears mainly in geometry textbooks and puzzles.
Regular decagons have equal sides and angles; irregular ones do not.
The stop sign's octagon is familiar, but decagons are harder to spot in everyday life.
Corner points of shapes
- anglesRotation between intersecting lines
- sidesLateral edges or teams
- perimeterShape's outer edge length
- areaExtent of surface
diagonals · regular · irregular · convex · concave · circumscribed · inscribed · two-dimensional
By a factor of ten
- rotationalConcerning circular movement
- reflectiveCasting back light
- dihedralAngle joining two planes
- radialEmanating from center
bilateral · mirror · axes · invariance · congruence · pattern
Seven-sided closed figure
- nonagonNine-sided closed figure
- dodecagonTwelve-sided plane figure
- triangleThree-sided plane figure
- quadrilateralFour-sided closed figure
vertices
Corner points of shapes
- anglesRotation between intersecting lines
- sidesLateral edges or teams
- perimeterShape's outer edge length
area · diagonals · regular · irregular · convex · concave · circumscribed · inscribed · two-dimensional · equilateral
tenfold
By a factor of ten
- rotationalConcerning circular movement
- reflectiveCasting back light
- dihedralAngle joining two planes
radial · bilateral · mirror · axes · invariance · congruence · pattern
heptagon
Seven-sided closed figure
decimal
Tenths-based notation
- geometric shapessphere, triangle, square, cone, rectangle
- polygonstriangle, quadrilateral, heptagon, nonagon, dodecagon
- shapescircle, square, triangle, rectangle, oval
- Ten thingsdime, decimal, fingers, toes, commandments
- Deca- wordsdecimeter, decaliter, decuple, decennial
- geometryangles, circles, angle, shapes, lines