The circumference of a circle is 6.28dm, so the circumference of its semicircle is 3.14dm______ (judge right or wrong)

The circumference of a circle is 6.28dm, so the circumference of its semicircle is 3.14dm______ (judge right or wrong)

The circumference of the semicircle is 5.14 decimeters. So the answer is: X

It is known that the circumference of a semicircle is 10.28 meters. Find the radius and area of the semicircle

The circumference of semicircle C = π R + 2R = 3.14r + 2R = 10.28
R = 10.28 / 5.14 = 2m
The area is s = 1 / 2 * π R & # 178; = 1 / 2 * 3.14 * 4 = 6.28 square meters

The area ratio of a circle is equal to the radius squared ratio, and the perimeter ratio of that circle is equal to ()

The ratio of the circumference of a circle is equal to (the ratio of diameters or radii)