2007-03-05 00:51:42 · 4 answers · asked by bekah_2009 2 in Education & Reference ➔ Homework Help
Area: 13.448592691265153
Diameter: 4.138028520389279
Circumference: 13
calculator
2007-03-05 01:00:35 · answer #1 · answered by ????? 7 · 0⤊ 0⤋
circum=2(pi)r
area=pi(r^2)
13=2(pi)r
r=13/(2(pi))
area=pi*((13/(2(pi)))^2
pi*(169/(4(pi^2)))
(169(pi))/(4(pi^2))
169/(4(pi))
pi=22/7
169/(4(22/7))
(169*7)/(4*22)
1183/88=13.443181818
rounded to the nearest 100th is 13.44
i didnt use the calculator to the final step. i hope this helps matty
2007-03-05 09:16:04 · answer #2 · answered by Matty G 2 · 0⤊ 0⤋
circumference = pi x 2r
13 = pi x 2r
13/2pi = r
r = 2.06991426
area = pi x r^2
area = pi x (2.06991426)^2
area = 13.45
2007-03-05 08:57:11 · answer #3 · answered by crzywriter 5 · 0⤊ 0⤋
circumference = pi(D)
13 = pi(D)
D = 13/pi
D = 13/3.1416
D = 4.138
Area = piD^2
A = pi(4.138)^2
A = 53.79
2007-03-05 08:58:48 · answer #4 · answered by exo 7 · 0⤊ 0⤋