The diameter of a round dinner plate is 10 inches. What's the area of the plate?
Lets say pi is 3.14
The area of a circle is: piradius squared
The radius is half the diameter so it is 5 inches.
3.145 squared 2
3.14*25
78.5inches squared
78.54
Area of a circle is pi•radius squared
Radius is half or diameter
So pi•5 squared which is 78.54