Answer:
______________________________________________________The area of the circular mirror, in "square inches", is:
is: "
254.34 in² " .
______________________________________________________
Note:
______________________________________________diameter, "d" = 18 in. (given) ;
radius, "r" = "d/ 2 " = "(18 inches) / 2 " = 9 in. ;
______________________________________________Area of a circle, "A" :
A =
* r² ;
in which: " A = Area of circle ("plate"); in units of "square inches"; or "in² " ;
"
= 3.14 " {approximation we shall use} ;
"r = radius = 9 in." ;
________________________________________________________
Plug in our known values to solve for the area, "A" :
A = (3.14) * (9 in)² ;
A = (3.14) * (9)² * (in²) ; A = (3.14) * (9) * (9) * (in²) ;
A = (3.14) * (81) * (in²) ;
_____________________________________________
A = 254.34 in² ._____________________________________________