This 10-minute video lesson shows that three points uniquely define a circle and that the center of a circle is the circumcenter for any triangle that the circle is circumscribed about.

This art history video discussion looks at Thutmose's "Model Bust of Queen Nefertiti", New Kingdom, 18th dynasty, c. 1340 BCE, limestone and plaster (Egyptian Museum and Papyrus Collection/Neues Museum, Berlin).

This art history video discussion looks at Jacopo Tintoretto's "The Origin of the Milky Way", c. 1575, oil on canvas (The National Gallery, London).

In this Smarthistory video Dr. Steven Zucker and Dr. Beth Harris discuss Titian's "Assumption of the Virgin," c. 1516-18, oil on wood, at the Santa Maria Gloriosa dei Frari in Venice.

This art history video discussion looks at Titian's "Bacchus and Ariadne", 1523-24, oil on canvas now atop board (National Gallery, London). Part of a mythological cycle painted by Titian and Giovanni Bellini and commissioned by Alfonso d'Este, Duke of Ferrara that includes The Feast of the Gods and the Andrians. Originally hung in the studiolo or Camerini d'Alabastro of the Duke's Ferranese castle.

This art history video discussion considers Titian's "Christ Crowned with Thorns" c. 1570‰غز76, oil on canvas. Alte Pinakothek, Munich.

In this Smarthistory video Dr. Beth Harris & Dr. Steven Zucker discuss Titian's "Madonna of the Pesaro Family" 1519-26, oil on canvas, at the Santa Maria Gloriosa dei Frari in Venice.

This art history video discussion looks at Titian's "Noli me Tangere", c. 1514, oil on canvas (The National Gallery, London).

This art history video discussion looks at Titian's "Venus of Urbino" 1538, oil on canvas (Galleria degli Uffizi, Florence).

This art history video discussion looks at Henri de Toulouse-Lautrec "At the Moulin Rouge", 1893-95, oil on canvas (Art Institute of Chicago).

This art history video discussion examines Verrocchio's (with Leonardo) "Baptism of Christ", 1470-75.

This art history video discussion looks at "Joseph Mallord William Turner, Rain, Steam, and Speed -- The Great Western Railway", oil on canvas, 1844 (National Gallery, London). It depicts the Maidenhead Railway Bridge (completed (1838) looking east, across the River Thames between Taplow and Maidenhead.

This art history video looks at Joseph Mallord William Turner" "Slave Ship (Slavers Throwing Overboard the Dead and Dying, Typhoon Coming On" from 1840. Oil on canvas, Museum of Fine Arts, Boston.

This art history video features a conversation between Dr. Elizabeth Macaulay-Lewis and Dr. Steven Zucker in front of "Two Royal Figures," Iran (Saljuq period), mid 11th - mid 12th c., painted and gilded stucco (Metropolitan Museum of Art).

This art history video discussion looks at Umbo's (Otto Umbehr) "The Roving Reporter", photomontage (rephotographed), 1926.

This art history video discussion examines "The Unicorn in Captivity" (one of seven woven hangings popularly known as the Unicorn Tapestries or the Hunt of the Unicorn), 1495-1505, South Netherlandish, wool, silk, silver, and gilt (The Cloisters, The Metropolitan Museum of Art).

This art history video discussion examines Jan Van Eyck's "Portrait of Giovanni Arnolfini and his Wife", tempera and oil on wood, 1434 (National Gallery, London).

This art history video discussion looks at Jan van Eyck's "The Madonna in the Church", c. 1438, oil on oak (Gemaldegalerie, Staatliche Museen zu Berlin).

This art history video discussion looks at Rogier van der Weyden's "The Crucifixion, with the Virgin and Saint John the Evangelist Mourning", c. 1460, oil on panel (Philadelphia Museum of Art).