Answer:
800
cm²
Explanation:
Given parameters:
radius of the coin = 20cm
Unknown:
Surface area of the coin = ?
Solution:
A coin is made up of two faces;
Surface area = 2(πr²)
Insert the parameters and solve;
Surface area = 2(
)
Surface area = 800
cm²
Sinkholes and caves are 2 reasons. hope that helped

The correct choice is ~ A
Bikes don't require gasoline for their functioning, so it causes less air pollution.
Answer:
The total number of significant figures is twelve.
Explanation: