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circumference Options
Posted: Tuesday, October 17, 2017 12:00:00 AM
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(noun) The boundary line of a figure, area, or object.

Synonyms: circuit

Usage: He had walked the full circumference of his land, repairing his fence along the way.
Posted: Tuesday, October 17, 2017 2:39:01 AM
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I would assume that perimeter is also a good synonym
from perimeter on this site:
1. Mathematics
a. A closed line bounding a plane area.
b. The length of such a line.
2. The outer limits of an area. See Synonyms at circumference.
3. A defended boundary protecting a military position
steve.r hudson
Posted: Tuesday, October 17, 2017 3:10:56 AM

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I had thought circumference the measurement of the boundary line of a circle or curved object and hadn't realised it's other uses, thanks.
Posted: Tuesday, October 17, 2017 3:10:56 AM

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"Are there any boundaries of the cashback because I am confused while thinking about pizza with topping or, sorry, toppings?" Asked Salvatore Emil Zola in his pitched voice. "No" - answered Mermaid Man. "As long as you stay within the compass of the schoolyard".
Posted: Tuesday, October 17, 2017 5:17:13 AM

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Eratosthenes' Calculation of the Earth's Circumference

In 240 B.C., the Greek astronomer Eratosthenes made the first good measurement of the size of Earth. By noting the angles of shadows in two cities on the Summer Solstice, and by performing the right calculations using his knowledge of geometry and the distance between the cities, Eratosthenes was able to make a remarkably accurate calculation of the circumference of Earth. Let's take a closer look at how he did it!

Eratosthenes lived in the city of Alexandria, near the mouth of the Nile River by the Mediterranean coast, in northern Egypt. He knew that on a certain day each year, the Summer Solstice, in the town of Syene in southern Egypt, there was no shadow at the bottom of a well. He realized that this meant the Sun was directly overhead in Syene at noon on that day each year.

Eratosthenes knew that the Sun was never directly overhead, even on the Summer Solstice, in his home city of Alexandria, which is further north than Syene. He realized that he could determine how far away from directly overhead the Sun was in Alexandria by measuring the angle formed by a shadow from a vertical object. He measured the length of the shadow of a tall tower in Alexandria, and used simple geometry to calculate the angle between the shadow and the vertical tower. This angle turned out to be about 7.2 degrees.

Next, Eratosthenes used a bit more geometry to reason that the shadow's angle would be the same as the angle between Alexandria and Syene as measured from the Earth's center. Conveniently, 7.2 degrees is 1/50th of a full circle ( 50 x 7.2° = 360° ). Eratosthenes understood that if he could determine the distance between Alexandria and Syene, he would merely have to multiply that distance by 50 to find the circumference of Earth!

Here's where things get a bit tricky. Eratosthenes had the distance between the two cities measured. His records show that the distance was found to be 5,000 stadia. The stadion (plural = stadia) was a common distance unit of the time. Unfortunately, there was not a universal, standard length for the stadion; so we don't know exactly which version of the stadion Eratosthenes used, and therefore are not exactly sure how accurate his solution was. He may have been correct to within less than 1%, a remarkable accomplishment! Or, if it was actually a different stadion that he used, he may have been off by about 16%. That is still pretty good! The actual polar circumference of Earth is just a bit over 40 thousand km (about 24,860 miles).

raghd muhi al-deen
Posted: Tuesday, October 17, 2017 10:17:04 AM

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Also found in: Thesaurus, Medical, Legal, Acronyms, Encyclopedia, Wikipedia.
cir·cum·fer·ence (sər-kŭm′fər-əns)
1. The boundary line of a circle.
a. The boundary line of an area or object.
b. Abbr. c or circ. The length of such a line.
3. The margin or area surrounding something.
[Middle English, from Old French circonference, from Latin circumferentia, from circumferēns, circumferent-, present participle of circumferre, to carry around : circum-, circum- + ferre, to carry; see bher- in Indo-European roots.]
cir·cum′fer·en′tial (-fə-rĕn′shəl) adj.
Synonyms: circumference, circuit, compass, perimeter, periphery
These nouns refer to a boundary or area around the outer edge of something: drove around the circumference of the city; followed the circuit around the park; stayed within the compass of the schoolyard; walked the perimeter of the estate; fenced the periphery of the property.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
circumference (səˈkʌmfərəns)

with my pleasure
Irma Crespo
Posted: Wednesday, October 18, 2017 10:51:25 PM

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Definition: (noun) The boundary line of a figure, area, or object.
Synonyms: circuit
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