I have to find the value or r. correct to one decimal place, if:
C= 2лr and C = 120
but i dunno how to get the answer though i looked in back and the answer is 19.1
л is supposed to symbolize pi
2007-03-13 22:38:19 · 5 answers · asked by David B 1 in Science & Mathematics ➔ Astronomy & Space
wow u guys r fast haha neways can u help me with another one
finding r
A= P(1+r) to the power of n
a = 9750 and p = 5000 and n = 7
2007-03-13 22:51:10 · update #1
<>OK, you have to know that pi=3.14159. Then, substitute every thing you know into your equation:
120=2*3.14159*r and multiply on the right
120=6.28318r and divide both sides by the the 6.28318
r= 19.09860 which rounds off to 19.1
2007-03-13 22:42:09 · answer #1 · answered by druid 7 · 0⤊ 1⤋
simple
r = C/2(pi)
the value of pi = 3.14 or 22/7 or 355/115
calculate and u get the answer r = 19.08
rounding off to 1 decimal place the answer is 19.1!
2007-03-13 22:45:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
If C is both 120 and 2(pi)r, then 120 = 2 x pi x r
or 120/(2 x pi) = r
Grab a calculator!
2007-03-13 22:54:27 · answer #3 · answered by SteveK 5 · 0⤊ 0⤋
ehhh, u just transform the equation to r = C/2Pi
r = C/2Pi = 120/(2*3.1415) = 19.098
and round r up to one digit after the comma, what results in 19.1 like ur answer claims.
2007-03-13 22:44:11 · answer #4 · answered by Anonymous · 0⤊ 0⤋
pi = 3.1416
2007-03-13 22:45:47 · answer #5 · answered by Iridflare 7 · 0⤊ 1⤋