Twice as big.
It can have any value up to 392 square cm.
A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.
Perimeter of the semicircle including its base: 180/360*pi*45+45 = 115.686 cm rounded to 3 decimal places
50.25cm
25
Twice as big.
It is: pi*4^2 divided by 2 = 8/pi which is about 25 square cm
It can have any value up to 392 square cm.
8*pi + 16 = 41.13 cm (approx)It depends on whether 8 cm is the radius or diameter of the semicircle.
A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.
In a semicircle, the diameter is the straight line. It is also equal to double the radius, and that property allows it to be used when calculating area and circumference.
2328.31286 cm2
Perimeter of the semicircle including its base: 180/360*pi*45+45 = 115.686 cm rounded to 3 decimal places
50.25cm
Area of circle is pi r^2, in this case approx 314 sq cm (3.14 x 10 x 10). For your semi-circle, half of this ie 157 sq cm
The diameter of the semicircle will be twice the radius.