Answer:
1.) If the given radius on Circle A is 11cm, then its diameter shall be 121 cm, why?
To get the diameter of a radius, then you must multiply 2 to the number of the radius itself. To get the area, you must do this solution below:
A = Pi squared centimeters
A = 3.14 x (11 cm) squared
A = 3.14 x (11 cm x 11 cm)
A = 3.14 x 121 cm squared
A = 379.94 cm squared <- answer
2.) If the given radius on Circle B is 3 meters, then the diameter is 9m, like what I said, you must multiply 2 to the number of the radius to get the diameter.
Use the same solution as Circle A:
A = Pi meters squared
A = 3.14 x ( 3m ) squared
A = 3.14 x (3cm x 3cm)
A = 3.14 x 9cm
A = 28.26cm squared <- answer
3.) If there is no given radius and all that is the diameter on Circle C, which is 40 mm, then you have to find the half of the diameter, which is 20mm, then do the same exact solution as the two other Circles:
A = Pi milimeters squared
A = 3.14 x (40cm)
A = 3.14 x (40cm x 40cm)
A = 3.14 x 1600cm
A = 50.24 mm squared <- answer
Those are my answers, it took me a very long time to solve, but, I hope this helps you :)
