What is the distance the hula hoop rolls in 4 full rotations?
2 answers:
Answer:
879.65
Step-by-step explanation:
Givens
r = 35 cm
pi = 3.14
Formula
Circumference = 2*pi*r
Solve for 1 loop
C = 2*pi * r
C = 2 * 3.14 * 35
C = 219.9 cm for 1 loop
Solve for 4 loops
1 loop gives 219.9 cm distance that will be covered.
4 loops = x
1/4 = 219.9/ x Cross multiply
x = 4 * 219.9 Combine on the right.
x = 879.65 cm
Circumference is 2rπ
so if I know Radius 35
R= C/2π
so
35 = C/2π
35 x 2π = C
219.8 is the circumference
so 4 rotations is 4 x 219.8 = 879.2 cm rounded to nearest cm is 879cm
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