2. The circumference of a circle is 3.14 units. What is the radius of this circle?
3. The radius of a circle is 7/22 units. Find its circumference.
4. A central angle of a circle is an angle whose vertex is the center of a circle. A 90 degree angle intersects an arc of the circle that has a length that is 1/4 the circumference. Find the length of the arc intersected by a 145 degree central angle of a circle that has a diameter of 8 feet.
2007-02-05 17:57:59 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
1. circumference = 2piR
3.14 = 2piR
3.14/2pi = R
2. same above, do the stuff in reverse
3. too long jjaja
2007-02-05 18:01:52 · answer #1 · answered by nico 2 · 0⤊ 0⤋
1.
circumference= 2.pi.r
=> pi=circumference/(2pi.r)
=>pi= 4.082/4/82=0.8468
(but if the circumference=4.82 then the radius=1)
2.
7/22=0.31818
=> 2.pi.r= (2)(3.14)(0.31818)=2(approximately)
2007-02-06 02:08:23 · answer #2 · answered by Armin 3 · 0⤊ 0⤋
1.circumference=2*3.14*r
4.082/6.28=r
r=.65
2.r=1/2
3. c=2*3.14*7/22
c=2
4.
2007-02-06 02:29:31 · answer #3 · answered by mitul goel 2 · 0⤊ 0⤋
1.
r = 4.082/(2Ï) = 2.041/Ï = 0.6496705
2.
r = 3.14/(2Ï) = 0.5 (using Ï = 3.14)
3.
C = 2Ïr = 2Ï*7/22 = 2 (using Ï = 22/7
L = 8Ï(145)/180 = 20.246 ft.
2007-02-06 02:22:22 · answer #4 · answered by Helmut 7 · 0⤊ 0⤋
5. Do your own homework.
2007-02-06 02:02:36 · answer #5 · answered by [we're all mad here] 4 · 0⤊ 0⤋
1answer= 25.63496
2007-02-06 02:19:17 · answer #6 · answered by deepak k 1 · 0⤊ 0⤋