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30 inches

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Q: If a radius is 15 inches long how long is a diameter?
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If a radius is 15 inches long how long is the diameter?

30 inches. The diameter is twice the length of the radius.


If a radius is 15 inches long, how long is a diameter?

The radius of a circle is half the diameter, thus your measurement is 30 inches


If the radius of a circle is 15 inches what is the diameter?

R=D/2. If the diameter of a circle is 18 inches, the radius is 9 inches. Radius = 1/2 diameter or 9"


What is the diameter if the circumference is 15 inches with a radius of 2 inches?

If the radius is 2 then the diameter is 2*2 = 4 inches and the circumference is about 12.6 inches and not 15 inches


What is the circumference of a circle with a diameter of 15 inches and a radius of 7.5 inches?

Circumference = Pi multiplied by the diameter. C = (3.1415)(15 in.) = 47.12 in. Therefore, the circumference of a circle with a diameter of 15 in. and a radius of 7.5 in. is approximately 47.12 inches.


The radius of a your circle is 15 inches what us the diameter?

30 inches


What is the diameter of a circle that has a radius of 7.5 in?

15 inches.


Can a 205 65 R15 tire fit on any 15 radius rim?

No ! the radius of the tire has to be 7.5 inches not 15 inches. The diameter has to be 15 inches, and the width has to be compatible with the tire width.


If the diameter is 15 what is the radius?

If the diameter is 15 then the radius is 7.5.


How long in inches is 15 degrees of circumference on 12 feet outside diameter tank?

Convert the degrees to radians. Also, you need the radius, not the diameter. In that case, the distance along the circle is simply the product of the angle, and the radius.


What is the radius of a circle with a diameter of 15 cm?

The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm


What is the radius of a circle whose diameter is 15 meters?

The radius of a circle is 1/2 of its diameter. If the diameter is 15 meters, then the radius is 7.5 meters.