That's virtually impossible to say until you explain
what you mean by the 'radius' of a square.
Area of a circle in square cm = pi*radius squared
A circle with a radius of 19 cm has an area of 1,134.11 square cm.
A circle with a radius of 2 cm has an area of 12.57 square cm.
A circle with a radius of 25 cm has an area of 1,963.5 square cm.
A circle with a radius of 4 cm has an area of 50.27 square cm.
Surface area = 4*pi*32 = 36pi square cm
Area of a circle in square cm = pi*radius squared
A circle with a radius of 3 cm has an area of 28.27 square cm.
A circle with a radius of 19 cm has an area of 1,134.11 square cm.
A circle with a radius of 2 cm has an area of 12.57 square cm.
A circle with a radius of 25 cm has an area of 1,963.5 square cm.
A circle with a radius of 4 cm has an area of 50.27 square cm.
A circle with a radius of 2.7 cm has an area of 22.9 square cm.
A circle with a radius of 8.2 cm has an area of 211.24 square cm.
A circle with a radius of 4 cm has an area of 50.27 square cm.
A circle with a radius of 4 cm has an area of 50.27 square cm.
A circle with a radius of 19 cm has an area of 1,134.11 square cm.