I need to find the radius and diameter.
1. Area= 109in^2
2. Area= 113.10cm^2
3.. Circumference= 20in
2007-03-08 12:50:37 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Radius = Square Root of (Area / pi)
Radius = Circumference / (2 * pi)
Diameter = 2 * Radius
2007-03-08 12:57:49 · answer #1 · answered by Owlwings 7 · 0⤊ 0⤋
In a circle with radius r, the diameter is 2 r. The area is pi*r^2.
1) 109 = pi*r^2
r=sqrt(109/pi)
diameter = 2sqrt(109/pi) inches
2) 113.10 = pi*r^2
r=sqrt(113.10/pi)
diameter = 2sqrt(113.10/pi) cm
3) The circumference of a circle is pi*diameter
20 = pi*diameter
diameter = 20/pi
r=10/pi
2007-03-08 12:56:22 · answer #2 · answered by Aegor R 4 · 0⤊ 0⤋
you ought to keep in mind that a hundred and eighty deg = pi radians so, from above you will locate each and all of the needed radians: 2 x pi = 360 a million x pi = a hundred and eighty (pi /2) = ninety (pi/4) = 40 5 (pi/8) = 22.5 and so on and so on Radian is a around degree. desire this facilitates
2016-12-14 14:21:56 · answer #3 · answered by daies 4 · 0⤊ 0⤋
diameter: 20/pi
radius: 10/pi
2007-03-08 12:55:51 · answer #4 · answered by chinmokuchibi 1 · 0⤊ 0⤋
Area = piR^2
Circumference = 2piR
Diameter = 2R
just plug your numbers into the equation
2007-03-08 12:53:36 · answer #5 · answered by Mantis 2 · 0⤊ 0⤋