Given only the lateral area, you cannot determine the diameter.
area = π x diameter2 / 4
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.
multiple the diameter by 2 to get the radius, then use your equation and go from there
half the diameter and then get the radius times pi and square it
If the area of a circle is given as 67cm squared, the diameter is 9.236 cm and the circumference is 29.02 cm
A = pi x d2 / 4
Area = pi*r2 where r is the radius. Since r = diameter/2, then area = pi*d2/4
A=(pi)r2 d=2r Divide the given area by pi(3.14) and take the square root. This is the radius so multiply by 2 to get the diameter.
if you are given a diameter divide it by two to get the radius! From then on, it is just simple Pi R Squared
depends greatly on the thing you are working with. assuming a circle with area A the diameter is 2*sqrt(A*pi) since A =r*r*pi and diameter=2*r
divide the diameter by 2 and square the number you just got and then multiply it by pi