Q: How do you find the area of a circle when given diameter?

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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.

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

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

Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter

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.

Related questions

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.

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

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

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

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.

Diameter of a circle = circumference/pi

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

if you are given a diameter divide it by two to get the radius! From then on, it is just simple Pi R Squared

If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.

To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)

Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter