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Common Square Roots

What are square roots and why do we care? The square root of a number is a number that, when multiplied by itself, equals the desired value. So, for example, the square root of 49 is 7 (7x7=49). The…

Finding Square Roots

The easiest way to find a square root is to use a calculator, but you can do it without one. Here’s one way, using 12 as an example of the squared number:Pick a number that when squared,…

acre, measure of land area

(Encyclopedia) acre, measure of land area used in the English units of measurement. The acre was originally the area a yoke of oxen could plow in a day and therefore differed in size from one…

abacus, in architecture

(Encyclopedia) abacusabacusăbˈəkəs [key], in architecture, flat slab forming the top member of a capital. In classical orders it varies from a square form having unmolded sides in the Greek Doric, to…

Giralda

(Encyclopedia) GiraldaGiraldahērälˈdä [key], the famous tower adjoining the Cathedral of Seville, Spain. It was built (1163–84) to serve as minaret to the main mosque of Seville, on the site of which…

matrix

(Encyclopedia) matrix, in mathematics, a rectangular array of elements (e.g., numbers) considered as a single entity. A matrix is distinguished by the number of rows and columns it contains. The…

Concorde, Place de la

(Encyclopedia) Concorde, Place de laConcorde, Place de lapläs də lä kôNkôrdˈ [key], large square, Paris, France. It is bounded by the Tuileries gardens; the Champs Élysées; the Seine River; and a…

Delany, Samuel R.

(Encyclopedia) Delany, Samuel R. (Samuel Ray Delany, Jr.), 1942–, African-American wrtier, b. Harlem, New York City. Delany uses science fiction, fantasy, and memoir to explore sexual identity, race…

Capitoline Hill

(Encyclopedia) Capitoline HillCapitoline Hillkăpˈĭtəlīnˌ [key] or Capitol, highest of the seven hills of ancient Rome, historic and religious center of the city. The great temple of Jupiter…