2007-07-30 22:47:24 · 9 answers · asked by Whatever 1 in Science & Mathematics ➔ Mathematics
area of circle = pi* [radius^2]
and diameter D= radius *2
so ratio of area=[ pi*[R^2] ]/ [pi*[D/2]^2]
so ratio =4 *[R/D]^2
2007-07-30 22:59:34 · answer #1 · answered by titu-the matrix 2 · 0⤊ 1⤋
Circumference = 2 pi r Circle A = 2pir = pi 2r = a million r = a million/2 Circle B =2pir = 3pi 2r = 3 r = 3/2 portion of circle A = pi *a million/2 *a million/2 = a million/4pi portion of circle B = pi *3/2 *3/2 = 9/4 pi Ratio of portion of the circles = a million:9 Ratio of diameters = a million:3 Ratio of radii = a million:3
2016-10-08 21:33:08 · answer #2 · answered by ? 4 · 0⤊ 0⤋
The ratio of their area is:
R^2:{D/2}^2
2007-07-30 23:02:55 · answer #3 · answered by simchem 1 · 0⤊ 1⤋
R and D are completely different numbers
first circle: R^2 pi
second circle: (D/2)^2 pi
R^2pi / (D/2)^2pi
= R^2 / (D^2 / 4)
= 4 (R/D)^2
2007-07-30 23:04:28 · answer #4 · answered by 7 · 0⤊ 1⤋
Ist circle's radius=R
IInd circle's radius=D /2=R
Area=pi r sq
=pi.r.r/pi.r.r
=1/1
2007-07-30 22:58:26 · answer #5 · answered by anuradha dhavalikar 2 · 0⤊ 1⤋
Area of circle 1 = A1 = πR²
Area of circle 2 = A2 = π(D/2)²
A1 : A2 = πR² : π(D/2)²
A1 : A2 = R² : D² / 4
A1 : A2 = 4R² : D²
2007-08-02 02:56:09 · answer #6 · answered by Como 7 · 1⤊ 1⤋
((R)^2) / ((D/2)^2)
2007-07-30 22:53:23 · answer #7 · answered by herbman76 2 · 0⤊ 1⤋
4R^2 : D^2
2007-07-30 23:01:52 · answer #8 · answered by yesraajkumar 1 · 0⤊ 1⤋
2R=D
2:1
2007-07-30 22:54:19 · answer #9 · answered by Anonymous · 1⤊ 1⤋