Q: What is the area of a circle given the diameter is 15ft?

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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.

diameter refers to the area across a circle through its center. it is the longest chord possible for any given circle.

multiple the diameter by 2 to get the radius, then use your equation and go from there

A = pi x d2 / 4

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

Related questions

If the area of a circle is given as 67cm squared, the diameter is 9.236 cm and the circumference is 29.02 cm

The area of a circle is A = pi times diameter² / 4. Given diameter d = 10 inches. Area A = 78.5398 inches².

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.

By using the other information supplied about the circle to calculate either its radius (from which its area can be calculated) or its area (if the circle is similar to another with a given area and some ratio between the two circle is given):If the diameter is given: radius = diameter ÷ 2If the circumference is given: radius = circumference ÷ 2πIf the circle is similar to another circle which has a given area, and the length ratio is given; square the length ratio to get the area ratio and apply to the given area.

TTr2 [Pi r squared] finds the area of the circle. TT x d [Pi x diameter] finds the circumference of a circle]

diameter refers to the area across a circle through its center. it is the longest chord possible for any given circle.

multiple the diameter by 2 to get the radius, then use your equation and go from there

A = pi x d2 / 4

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

The circumference of a circle is given by Circumference = pi x diameter. The area of a circle is given by Area = pi/4 x diameter2. Thus for a circle with circumference c = 12 in. The area will equal a = 11.459 in2.

in place of r (radius) write d/2 where d is diameter

Area = pi*r2 where r is the radius. Since r = diameter/2, then area = pi*d2/4