Answer:
D=2r thus: 42 ft
Step-by-step explanation:
Answer:
The diameter of an atom is 25000 times the diameter of a pearl.
Step-by-step explanation:
Given that,
The diameter of a pearl is 
The diameter of an atom is 
Taking the ratio,

So, the diameter of an atom is 25000 times the diameter of a pearl.
They are equal because if you make 4/5 into a denominator of 10 it is 8/10