Respuesta :
To find the area of the coin/a circle we use this equation:
(a = area, r = radius, d = diameter)
a = r²
So we need to do for the radius.
r = d/2
r = 18/2
r = 9
Then solve
a = 9²
a = 81
The correct answer is 81.
Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)
(a = area, r = radius, d = diameter)
a = r²
So we need to do for the radius.
r = d/2
r = 18/2
r = 9
Then solve
a = 9²
a = 81
The correct answer is 81.
Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)
The exact area of either face of the coin in terms of pi is 81π millimitres squared
Area of a circle
area = πr²
where
- r = radius
Therefore,
diameter = 2(radius)
radius = diameter / 2
radius = 18 / 2
radius = 9 mm
Hence,
area = π × 9²
area of the coin = 81π mm squared
learn more on area here: https://brainly.com/question/3303398
