SOLUTION: The top of a soda can has a 6.3 cm diameter. What is its radius? its circumference? its area?

Algebra ->  Surface-area -> SOLUTION: The top of a soda can has a 6.3 cm diameter. What is its radius? its circumference? its area?      Log On


   

Question 105031: The top of a soda can has a 6.3 cm diameter. What is its radius? its circumference? its area?
Answer by BurningFlame_marc(77) About Me  (Show Source):
You can put this solution on YOUR website!
Hello!

The radius of a circle is equal to diameter%2F2
circumference=2%2Api%2Aradius
area=pi%2Aradius%5E2

With those solution let's find it's radius.
radius is equal to diameter%2F2 so it is equal to 6.3(which is the diameter)/2
The radius is 3.15cm


Let's find the circumference.
circumference=2%2Api%2Aradius with the value 3.14 as pi, now we know that it is equal to 2*3.14*3.15.
The circumference is 19.782cm

Let's find the area.
area=pi%2Aradius%5E2
it is equal to 3.14*3.15^2
The area is 31.15665cm^2


note:pi is most of the time equal to 3.14