pi = 3.142 circumference = 28.4cm, calculate the radius to 2 significant figures?

0 ⤊

pi=3.142
c=28.4cm

r=c/2pi

28.4*3.141=8.9radius?

2006-12-05 04:46:04 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering

c = 2* Pi * r

so r = c / 2pi

r = 28.4 / (3.14159 * 2)

r = 28.4 / 6.28318

r = 4.52

2006-12-05 04:51:22 · answer #1 · answered by Anonymous · 0⤊ 0⤋

yep, as the others

4.52cm

2006-12-05 05:32:21 · answer #2 · answered by jonny red 4 · 0⤊ 0⤋

cir = 2pir

r = cir/2pi = 28.40/(2x3.14) = 4.52cm

2006-12-05 04:52:20 · answer #3 · answered by Anonymous · 0⤊ 0⤋