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Q: If the area is 75mm what is the radius?

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A=πr2Plug in the radius. Do the math.

75mm = 7.5cm

The area of a semicircle is half of the area of a circle. The area of a circle is pi x radius x radius. So the area of a semicircle is 1/2 x pi x radius x radius or (pi x radius x radius) / 2.

The area increases as the square of the radius (or diameter). So if you double the radius you * 4 (quadruple) the area. Treble the radius, you *9 the area.

When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.

If you triple the radius of a circle, the area will increase by 9. Area is proportional to the square of the radius.

Yes. The area is proportional to the square of the radius. If the radius becomes smaller, so does the area.

The area of a regular pentagon with a radius of 7 is 10.1716. If the radius was 5, the area would be 7.26543.

Volume = 4/3 * pi * radius * radius * radius Surface Area = 4 * pi * radius * radius

Use the formula for the area of a circle (area = pi x radius squared), replace what you know (in this case the area), and replace - in this case - for the radius.

As area = pi * radius2, the radius is given by radius = sqrt(area /pi) radius = sqrt(6644.24 / pi) = 46 with pi = 3.14

area = radius * radius * Math.pi;

Area of a circle = pi*radius squared

Area = pi*radius squared

The area of a circle of radius 21 is 1386

Radius 10, area = 100 pi; radius 9, area = 81 pi

2*radius=diametre radius=2.1 Area=pi*(radius)^2 Area=3.1428*2.1*2.1 Area=13.86

You can certainly express the radius as a function of its area, yes. If the area is known, you can solve the formula for the area of the circle to uniquely get the radius. (The quadratic equation has two solutions; you will of course choose the positive solution for the radius.)

A circle with a radius of 10m has an area of 314.16 m2

A radius is a line segment. It has no area.

Radius = +sqrt(Area/pi)

Area equals pi times the radius squared.

In relation to the area of a circle: pi*radius^2

The area of a circle is: pi times radius^2

Area = (pi) x (Radius)2 (Radius)2 = Area/pi Radius = sqrt(Area/pi) Diameter = 2 x radius = 2 x sqrt(Area/pi)