The definition of a circle is the plane figure whose circumference is everywhere equidistanct from its centre and also cirlce is a closed figure.((oxford Dictionary). If you make the circle half and we are calling it as semi circle by drawing an extra diameter to it. Really if we make the circle half we get half arc. The definition of arc is a part of the circumference of a circle. Examble if we break a bangle then we get half arc. My question is why to add diameter and call that thing as semi circle
2007-12-30 23:47:34 · 13 answers · asked by mad 5 in Science & Mathematics ➔ Geography
because it is half of what is necessary to form a circle. two of them placed together form a circle ergo semicircle.
2007-12-31 03:03:15 · answer #1 · answered by Loren S 7 · 0⤊ 0⤋
there is no point in calling a figure which is not closed , by a geometrical name. so diameter must be drawn.
i hope i am successful in clearing your doubt. good luck
2007-12-31 05:38:47 · answer #2 · answered by v 2 · 0⤊ 0⤋
how else could one halve a circle and it may be useful to some people to be able to describe a semi circle
2007-12-31 04:32:15 · answer #3 · answered by rosie recipe 7 · 0⤊ 0⤋
So that everyone knows exactly what is being talked about. Language is inherently imprecise, so we want to be as accurate as possible so that is you want to ask about a semi-circle, you don't get answers about an arc. The former implies an enclosed area figure, the latter a bent line.
To prove language is very imprecise, ask 5 people what a "dog" is. We all know a dog when we see one, but when you say "dog" everyone visualizes something different. Try it, the answers will be as revealing as they are amusing.
2007-12-31 00:48:59 · answer #4 · answered by Charles M 6 · 0⤊ 0⤋
Your question has the answer, it has to be a CLOSED figure.
to somplete the figure, we add the diameter.
does the broken bangle look like a semi-circle? no! its just an arc. you need to close it to get a semi-circle.
2007-12-31 00:39:07 · answer #5 · answered by Tonks 2 · 1⤊ 1⤋
Thats because a semi circle makes an angle of 180* .All semi circles are arcs but all arcs are not semi cricles :P
2007-12-31 00:00:34 · answer #6 · answered by Peril Causing Devil 3 · 1⤊ 1⤋
First of all you need to understand what a circle is and what is an arc?? Circle is a closed figure where as arc is not closed. Arc joins two end points and has a curve, adding one line i.e. diameter turns it into a circle. Just a simple example to make you understand, why milk is milk and curd is curd, curd is prepared from milk just by adding of bacteria. Similarly, arc acted upon by a diameter, an extra component is added to turn it into a circle.
2007-12-30 23:57:24 · answer #7 · answered by rakhee c 2 · 1⤊ 1⤋
i don't know, i think they guy above has it, "just because"
2007-12-30 23:54:05 · answer #8 · answered by nonoodles74 7 · 0⤊ 1⤋
get a life......who cares about a circle or semi circle or whatever......if you really care....ask someone who really cares.......by the way...............................HI
2007-12-30 23:51:26 · answer #9 · answered by Anonymous · 0⤊ 1⤋
just because, that's why!
2007-12-30 23:50:10 · answer #10 · answered by sally b 3 · 0⤊ 1⤋