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
the Doppler effect. (I don't know how to explain it lol)
Batteries Produce DC current while homes produce AC current.
Hope this helped xxxx