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A trapezoid is a quadrilateral having only two of its sides parallel.

Trapezoid

A trapezoid is a quadrilateral having only two of its sides parallel.

A view of the left scaphoid seen from behind.

Left Scaphoid

A view of the left scaphoid seen from behind.

A view of the left scaphoid seen from in front.

Left Scaphoid

A view of the left scaphoid seen from in front.

The left trapezium as seen from the front.

Trapezium

The left trapezium as seen from the front.

The left trapezium as seen from the above and the mesal side.

Trapezium

The left trapezium as seen from the above and the mesal side.

The left trapezoid as seen from the above, the inner side, and behind.

Trapezoid

The left trapezoid as seen from the above, the inner side, and behind.

The left trapezoid as seen from the front, below, and outer side.

Trapezoid

The left trapezoid as seen from the front, below, and outer side.

The left os magnum, the outer side seen from below.

Os Magnum

The left os magnum, the outer side seen from below.

The second metacarpal of the left hand.

Metacarpal

The second metacarpal of the left hand.

The third metacarpal of the left hand.

Metacarpal

The third metacarpal of the left hand.

The fourth metacarpal of the left hand.

Metacarpal

The fourth metacarpal of the left hand.

The fifth metacarpal of the left hand.

Metacarpal

The fifth metacarpal of the left hand.

"Right fore foot of Indian Elephant. U, ulna; R, radius; c, cunelform; l, lunar; sc, scaphold; u, unciform; m, magnum; td, trapezoid; tm, trapezium; I to V, first to fifth digit." —The Encyclopedia Britannica, 1903

Elephant Foot

"Right fore foot of Indian Elephant. U, ulna; R, radius; c, cunelform; l, lunar; sc, scaphold; u, unciform;…

Trapezoid with angles and height labeled.

Trapezoid

Trapezoid with angles and height labeled.

Trapezoid with dimensions labeled. Trapezoid can be used to calculate area.

Trapezoid With Dimensions

Trapezoid with dimensions labeled. Trapezoid can be used to calculate area.

Illustration of a trapezium, a quadrilateral which has no two sides parallel.

Trapezium

Illustration of a trapezium, a quadrilateral which has no two sides parallel.

Illustration of a trapezoid, a quadrilateral which has two and only two sides parallel.

Trapezoid

Illustration of a trapezoid, a quadrilateral which has two and only two sides parallel.

Illustration of a trapezoid, with the median drawn. The median of a trapezoid is parallel to the bases, and is equal to half the sum of the bases.

Trapezoid With Median

Illustration of a trapezoid, with the median drawn. The median of a trapezoid is parallel to the bases,…

Illustrations to show trapezoids with lines joining the midpoints of the sides of any quadrilateral, taken in order.

Trapezoids With Lines Joining Midpoints

Illustrations to show trapezoids with lines joining the midpoints of the sides of any quadrilateral,…

Illustrations of a trapezoid with a line joining the midpoints of the diagonals.

Trapezoid With Lines Joining the Midpoints of the Diagonals

Illustrations of a trapezoid with a line joining the midpoints of the diagonals.

Illustrations of a trapezoid with a line segment drawn parallel to one side

Trapezoid With Line Segment Parallel to One Side

Illustrations of a trapezoid with a line segment drawn parallel to one side

Illustrations of a trapezoid.

Trapezoid

Illustrations of a trapezoid.

Illustrations of a trapezoid with diagonals drawn.

Trapezoid With Diagonals

Illustrations of a trapezoid with diagonals drawn.

Illustrations of an isosceles trapezoid with equal diagonals drawn.

Isosceles Trapezoid With Equal Diagonals

Illustrations of an isosceles trapezoid with equal diagonals drawn.

Articulations of bones of the carpus (wrist area). Labels: 1, ulna; 2, radius; 3, inter-articular fibro-cartilage; 4, metacarpal of thumb; 5, metacarpal of first finger; 6, metacarpal of second finger; 7, metacarpal of third finger; 8, metacarpal of fourth finger; S, scaphoid; L, lunar; C, cuneiform; P, pisiform; T, T, trapezium and trapezoid; M, magnum; U, unciform.

Bones of the Carpus

Articulations of bones of the carpus (wrist area). Labels: 1, ulna; 2, radius; 3, inter-articular fibro-cartilage;…

One large trapezoid for pattern block set.

Large Trapezoid for Pattern Block Set

One large trapezoid for pattern block set.

Three large trapezoids for pattern block set.

Large Trapezoids for Pattern Block Set

Three large trapezoids for pattern block set.

Three large trapezoids for pattern block set.

Large Trapezoids for Pattern Block Set

Three large trapezoids for pattern block set.

Fourteen small trapezoids for pattern block set.

Small Trapezoids for Pattern Block Set

Fourteen small trapezoids for pattern block set.

A flashcard featuring an illustration of a Trapezoid

Flashcard of a Trapezoid

A flashcard featuring an illustration of a Trapezoid

Illustration of a trapezoid with altitude a and bases b and b' used to demonstrate that the area is 1/2 the sum of the bases multiplied by the altitude.

Area of a Trapezoid

Illustration of a trapezoid with altitude a and bases b and b' used to demonstrate that the area is…

Illustration of a trapezium, a quadrilateral having no two sides parallel. The diagonal is labeled in this illustration.

Trapezium

Illustration of a trapezium, a quadrilateral having no two sides parallel. The diagonal is labeled in…

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921

Area of Trapezoid

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921

Area of Trapezoid

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

An illustration of a trapezoid with 4 sides and height labeled.

Trapezoid With Labels

An illustration of a trapezoid with 4 sides and height labeled.

The pons is composed chiefly of transverse fibers arranged in coarse bundles, longitudinal fibers gathered in compact bundles, and diffusely scattered masses of gray substance among the fiber bundles, the nuclei pontis. Shown is a section of the pons at its middle, showing trapezoid body.

Section of the Pons

The pons is composed chiefly of transverse fibers arranged in coarse bundles, longitudinal fibers gathered…

The right trapezoid bone.

Trapezoid Bone

The right trapezoid bone.

"Palmar aspect of left fore foot of a black bear (Ursus americanus). scl, scapholunar; c, cuneiform; p, pisiform; tr, trapezium; t, trapezoid; m, magnum; u, unciform. The phalanges show a full series of sesamoid bones (unmarked)." -Whitney, 1911

Bear Foot

"Palmar aspect of left fore foot of a black bear (Ursus americanus). scl, scapholunar; c, cuneiform;…

The skeleton of a horse. Axial Skeleton. The Skull. Cranial Bones: a, occipital, 1; b, wormian, 1; c, parietal, 2; d, frontal, 2; e, temporal, 2; sphenoid, 1; ethmoid, 1; auditory ossicles, 8. Facial bones: h, nasal, 2; g, lachrymal, 2; f, malar, 2; i, superior maxilla, 2; k, premaxila, 2; palatine, 2; pterygoid, 2; vomer, 1; tubinals, 4; l, inferior maxilla; 1; hyoid (segments), 5. Teeth: m, incisors, 12; n, canines, 4; o, molars, 24. The trunk: p-v, cervical vertebrae, 7; w, dorsal vertebrae, 18; x, lumbar vertebrae, 6; y, sacrum, 1; z, coccygeal vertebrae (variable), 18, d, d, ribs, 36; sternum (6-7 sternebrae), 7; *,coastal cartilages. Appendicular Skeleton. Pectoral Limb: e', scapula, 2; f', humerus, 2; g', radius, 2; h', ulna, 2. Carpus-i', trapesium, 2; k', cuneiform, 2; l', lunar, 2; m', scaphoid, 2; n', unciform, 2; o', magnum, 2; p', trapezoid, 2; q', pisiform, 2. Metacarpus-r', large bone, 2; s', small bone, 4. Digits- u', proximal phalanges, 2; v, median phalanges; w', distil phalanges, 2; t', large sesamoids, 4; small sesamoids, 2. Pelvic Limbs: Pelvis- b', ilium, 2; d' ischium, 2; c', pubis, 2. The limb- y', femur, 2; z', patella, 2; a', tibia, 2; b', fibula, 2. Tarsus- c', calcaneum, 2; d', astragalus, 2; e'. cuboid, 2; f', cuneiforme magnum, 2; g', cuneiforme medium, 2; h", cuneiforme parvum, 2. Metatarsus: large bone, 2; small bone, 4. Digit: proximal phalanges, 2; median phalanges, 2; distal phalanges, 2; large sesamoids, 4; small sesamoids, 2.

Skeleton of a Horse

The skeleton of a horse. Axial Skeleton. The Skull. Cranial Bones: a, occipital, 1; b, wormian, 1; c,…

Front aspect of the right carpus of a horse. Labels: 1, cuneiform; 2, lunar; 3, scaphoid; 4, trapezium; 5, unciform; 6, magnum; 7, trapezoid; 8, small metacarpals, the large one lying between and before them. The uppermost bone is the distal end of the radius.

Carpus of a Horse

Front aspect of the right carpus of a horse. Labels: 1, cuneiform; 2, lunar; 3, scaphoid; 4, trapezium;…

Skeleton of the hog. Axial skeleton. The skull. Cranial bones- a, occipital, 1; b, parietal, 2; d, frontal, 2; c, temporal, 2; sphenoid, 1; ethmoid, 1; auditory ossicles, 8. Facial Bones- g, nasal, 2; h, os rostri, 1; f, lachrymal, 2; e, malar, 2; i, maxilla, 2; k, premaxilla, 2; l, inferior maxilla, 1; palatine, 2; 2, pterygoid, 2; vomer, 1; turbinals, 4; hyoid series, 5. Teeth: incisors, 12; canines, 4; molars, 28. The trunk- m, cervicle vertebre (variable), 18; r, ribs, 28; * sternum (seven sternebrae), 1. Appendicular Skeleton. Pectoral Limb. v, scapula, 2; w, humerus, 2; x, radius, 2; y, ulna, 2. carpus: z, trapezium, 2; a', cuneiform, 2; b', lunar, 2; c', scaphoid, 2; d', unciform, 2; e', magnum, 2; f', trapezoid, 2; g', pisiform, phalanges, 8; l', distal phalanges, 8; l", small sesamoids, 8. Pelvic Limb. Pelvis: s, ilium, 2; t, pubis, 2; u, ischium, 2. The limb-m', femur, 2; n', patella, 2; o', tibia, 2; p' fibula, 2. Tarsus- q' calcaneum, 3; r', astragalus, 2; s', cuboid, 2; t', cuneiforme magnum, 2; u', ecto-cuneiforme, 2; v' w', meso and endo cuneiformes, 4. Metatatarsus: large bones, 8; x', small bones 2; y', large sesamoids, 16. Digit: proximal phalanges, 8; median phalanges, 8; distal phalanges, 8; small sesamoids, 8. Visceral Skeleton- None. The separate bones of the skeleton of the hog, as here considered, are 234.

Skeleton of a Hog

Skeleton of the hog. Axial skeleton. The skull. Cranial bones- a, occipital, 1; b, parietal, 2; d, frontal,…

The skeleton of the dog. Axial skeleton. The skull. Cranial bones- a, occipital, 1; b, parietal, 2; d, frontal, 2; c, temporal, 2; sphenoid, 1; ethmoid, 2; auditory ossicles, 8. Facial Bones- f, nasal, 2; e, lachrymal, 2; d, malar, 2; h, maxilla, 2; g, premaxilla, 2. Teeth: incisors, 12; canines, 4; molars, 26. The trunk- l, cervical vertebrae, 7; m, dorsal vertebrea, 13; n, lumbar vertebrae, 7; o, sacrum (three segments), 1; p, coccygeal phalanges (variable), 20; t, ribs, 26; * sternum (eight sternebrae), 1. Appendicular Skeleton. Pectoral Limb. u, scapula, 2; v, humerus, 2; w, radius, 2; x, ulna. Carpus: y, trapezium, 2; z cuneiform, 2; a', scaphoid, 2; b', unciform, 2; c', magnum, 2; d', trapezoid, 2; e', pisiform,2; metacarpal bones, 10; h', anterior sesamoids, 10; g' posterior sesamoids, 20. Digits- i' proximal phalanges, 10; k', median phalanges, 8; l', distal phalanges, 10; small sesamoids wanting. Pelvic Limb. Pelvis: q, ilium, 2; r, pubis, 2; s, ischium, 2. The limb-m', femur, 2; o', fabellae, 4; n', patella, 2; q', tibia, 2; p', tibial sesamoid, 2; r', fibula, 2. Tarsus: s', calcaneum, 2; t', astragalus, 2; u', cuboid, 2; v', superior cuneiform, 2; w', ectocuneiforme, 2; x', mesocuneiforme, 2; y', edocuneiforme, 2. Metatarsus: large bones, 8; z',small bones, 2; anterior sesamoids, 8; posterior sesamoids, 16. Digit: proximal phalanges, 8; median phalanges, 8; distal phalanges, 8; small sesamoids wanting. Visceral Skeleton. Os Penis, 1; Rudimentary clavicle (inconstant), 2. The bones of the Carnivora Skeleton, thus considered, are 345.

Skeleton of a Dog

The skeleton of the dog. Axial skeleton. The skull. Cranial bones- a, occipital, 1; b, parietal, 2;…

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid and parallel to the bases bisects the other of the non parallel sides also."

Line Bisecting Trapezoid Sides

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid…

Color flag of Kuwait. Three equal horizontal bands of green (top), white, and red with a black trapezoid based on the hoist side; design, which dates to 1961, based on the Arab revolt flag of World War I.

Flag of Kuwait, 2009

Color flag of Kuwait. Three equal horizontal bands of green (top), white, and red with a black trapezoid…

Black and white outline flag of Kuwait. Three equal horizontal bands of green (top), white, and red with a black trapezoid based on the hoist side; design, which dates to 1961, based on the Arab revolt flag of World War I

Flag of Kuwait, 2009

Black and white outline flag of Kuwait. Three equal horizontal bands of green (top), white, and red…

Pressure upon an oblique surface. In the image, pressure acts on all sides of the surface equally.

Oblique Surfaces

Pressure upon an oblique surface. In the image, pressure acts on all sides of the surface equally.