trapezoid
One parallel pair
A trapezoid is a four-sided polygon with at least one pair of parallel sides.
In American usage, exactly one pair is parallel; British usage calls this a trapezium and reserves trapezoid for quadrilaterals with no parallel sides.
The word appears most often in geometry classes: Calculate the area of the trapezoid.
The trapezius muscle in the upper back takes its name from the shape.
Four-sided closed figure
- parallelogramQuadrilateral with paired parallels
- polygonMultisided plane figure
- four-sidedHaving four straight boundaries
- baseSupporting bottom structure
parallel · legs · altitude · median · midsegment · diagonal · vertices · sides
Quadrilateral with paired parallels
- rhombusEquilateral parallelogram
- rectangleFour-sided, all right angles
- squareRhombus with right angles
- pentagonFive-sided closed figure
hexagon · polygon · kite · triangle · prism · pyramid · cross-section · geometric
Point where edges converge
- interiorInside area or region
- exteriorOuter portion
- degreesUnits of measurement
- acuteIntensely severe or perceptive
obtuse · right · supplementary · adjacent · parallel · measurement · protractor · congruent
quadrilateral
Four-sided closed figure
- parallelogramQuadrilateral with paired parallels
- polygonMultisided plane figure
- four-sidedHaving four straight boundaries
base · parallel · legs · altitude · median · midsegment · diagonal · vertices · sides · area
parallelogram
Quadrilateral with paired parallels
- rhombusEquilateral parallelogram
- rectangleFour-sided, all right angles
- squareRhombus with right angles
pentagon · hexagon · polygon · kite · triangle · prism · pyramid · cross-section · geometric · two-dimensional
vertex
Point where edges converge
acute · obtuse · right · supplementary · adjacent · parallel · measurement · protractor · congruent
trapezius
Diamond-shaped back muscle
shoulder · muscle · scapula · metacarpal · skeletal · hand · spine · neck · dorsal
table
Horizontal furniture surface
window · sign · banner · plinth · tray · marquee · awning · roof · gable · architectural
- geometryangles, circles, angle, shapes, lines
- quadrilateralsrectangle, square, rhombus, parallelogram, kite
- bonesskull, femur, tibia, skulls, humerus
- geometry termscircle, line, rectangle, side, square
- geometric shapessphere, triangle, square, cone, rectangle
- polygonspolygon, triangle, quadrilateral, pentagon, hexagon
trapezoidsquare
Rhombus with right angles
regular polygon · equilateral triangle · circle · rectangle · regular hexagon