How many square inches are there in a 4 inch round circle?

Answer 1

Approximately 12.56 square inches (and all cicrcles are round!). And cicrcles is spelled circles If you mean a circle that is 4 inches around the outside (the circumference) it would be 1.27 square inches.

If you mean across the circle, through the middle, it would be the famous equation, Pi R squared. (No, pie are round, cornbread are square. Yuck, yuck.)

Pi times the square of the Radius. In this case the diameter is 4, so the radius is two. Pi to four places is 3.1416.

Pi = 3.1416 The radius = 2 The radius squared = 4 So . . . 3.1416 x 4 = 12.56

Which is the first answer given above.