pentagon
Polygon with five
A pentagon is a five-sided polygon.
In geometry, a regular pentagon has equal sides and angles, each interior angle measuring 108 degrees.
The shape appears in nature, architecture, and design—from starfish to decorative tiles.
Draw a pentagon and connect all its vertices to form a five-pointed star. (Capitalized Pentagon refers to the U.S. military headquarters.)
Occurring at fixed intervals
- convexCurved outward externally
- equilateralHaving all sides congruent
- equiangularHaving all equal angles
- vertexPoint where edges converge
angle · diagonal · perimeter · area · symmetry · interior · plane · shape
A group of five
- quintetGroup of five
- quintupleMultiply by five
- five-pointedWith five radiating tips
- lustrumFive-year span
regular
Occurring at fixed intervals
- convexCurved outward externally
- equilateralHaving all sides congruent
- equiangularHaving all equal angles
vertex · angle · diagonal · perimeter · area · symmetry · interior · plane · shape · figure
pentad
A group of five
- quintetGroup of five
- quintupleMultiply by five
- five-pointedWith five radiating tips
drive
Operate a vehicle
- geometryangles, circles, angle, shapes, lines
- geometric shapessphere, triangle, square, cone, rectangle
- polygonstriangle, quadrilateral, heptagon, nonagon, dodecagon
- shapescircle, square, triangle, rectangle, oval
- fivesfive elements, five senses, five dollar bill, fiver, nickel
- Greek mathematicsEuclid, Archimedes, Pythagoras, geometry, theorem
pentagonState Department
Federal foreign affairs office
Foggy Bottom · United Nations · peace movement · diplomacy · disarmament
- The PentagonU.S. defense headquarters
- Pentagon PapersLeaked Defense Department documents
- inverted pentagramStar with vertex pointing down