2006-11-09 09:17:35 · 7 answers · asked by Grace 3 in Science & Mathematics ➔ Mathematics
ok theres a circle a part of it is shaded i have to find the radius of the non shaded part.
2006-11-09 09:21:56 · update #1
u can use the following formulas to find the radius
1)Area of circle=pi.*(radius)^2
when area is given plug in that value into this formula and u can get the radius
2)radius=diameter/2
when the diameter is given,find the radius by dividing the diameter by 2
3)circumference=2*pi.*r
when the circumference is given use the above formula to solve for the radius
there is no definite formula for the radius but depending the other value given u can solve for the radius.
hope that helps!!!
2006-11-09 09:25:57 · answer #1 · answered by Anonymous · 3⤊ 2⤋
The Radius of a circle is half the diameter. or D/2
2006-11-09 09:27:19 · answer #2 · answered by njapf2001 1 · 1⤊ 0⤋
That depends upon what is given. Circumference equals pi times the diameter. Area equals pi times the diameter divided by four. Guess what the diameter equals. The diameter is two times the radius.
2006-11-09 09:22:30 · answer #3 · answered by Jack 7 · 1⤊ 0⤋
if you are given the circumference (c) and required to find the radius; the formula would be 2(pi)r = c
where pi = 22/7
2 X 22/7 X r = c
Making r the subject we have:
r =7c/2X22 = 7c/44
You can then plug in the value of the circumference and knowing that pi = 22/7, you can plug that in as well and find r using
r = 7c/44
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On the other hand, if you are given the diameter (d), the radius is d/2
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Thirdly, if you are given the area of the circle (A)
A = pi X r^2
where pi = 22/7
A = 22/7 X r^2
make r the subject
r^2 = 7A/22
r = sqrt (7A/22)
Plug in A and solve
2006-11-09 09:20:05 · answer #4 · answered by Loral 2 · 3⤊ 0⤋
It's the same as the radius of the shaded part.
Shading doesn't matter.
You have to know something more than you're telling us about this circle. Such as, diameter, circumfrence, area, etc..........
2006-11-09 09:32:06 · answer #5 · answered by Steve 7 · 1⤊ 0⤋
The formula is to use the 2nd power for example if its 7 then 7 times 7 thats 49 then you multiply 49 times 3.14 that's how you get your answer.
2015-06-24 08:32:06 · answer #6 · answered by Exzoovier 2 · 0⤊ 0⤋
The square root of the area of a circle divided by pi
or The circumference of a circle divided by pi and divided by 2
2006-11-09 09:26:10 · answer #7 · answered by suniti 2 · 3⤊ 1⤋
Depends upon what you know. If you know the diameter, then d=2r.
If you know the area then A=pi r squared. If you know the circumference then C= 2 pi r.
2006-11-09 09:22:41 · answer #8 · answered by CAPTREE 4 · 1⤊ 0⤋
given what?
r=c/(2pi)
r=sqrt.(a/pi)
given a circle, draw an inscribed right triangle, and measure the hypotenuse
2006-11-09 09:25:11 · answer #9 · answered by rawfulcopter adfl;kasdjfl;kasdjf 3 · 3⤊ 0⤋