You could use a pair of calipers. Alternatively, measure its circumference using a piece of string and divide the measure by pi.
Internal diameter.
The radius of a circle is half the diameter.
with a big tape measure
If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.
Not normally
The definition of polar diameter can be given as the distance cutting through the spherical object, but cutting through the two poles . The cut must be vertical . There are two poles North Pole and South Pole.
Vernier calipers can be used to accurately measure a hard rod's diameter within seconds. And it's very easy to use.
The exact diameter of the geographic north pole (like the south pole) is in theory zero.
The diameter of the moon at the equator is 3476.28 kilometers. Measured from pole to pole, the diameter is 3471.94 kilometers.
Mercury is almost a perfect sphere - with a diameter of 4879.42 ± 1.0 km
For the width, measure the length of the track or pole and add an inch for overlap in the middle. The height should be measured from the top of the track or the small metal ring for a pole.
Approximately 12,756,320 meters in diameter at the equator. Approximately 12,715,430 meters in diameter from pole to pole.
Jupiter has about 1/10 the diameter of the Sun. Note that due to its fast rotation, there is a fairly large difference in the diameter, depending on whether you measure from pole to pole, or from equator to equator. Jupiter also has about 1/1000 the volume of the Sun, and 1/1000 of the Sun's mass.
13.2 cm, if the given measure is the diameter.13.2 cm, if the given measure is the diameter.13.2 cm, if the given measure is the diameter.13.2 cm, if the given measure is the diameter.
Internal diameter.
The Equatorial diameter of Mars: 6,792km or 4,220 miles.The Polar diameter of Mars: 6,752km or 4,196 miles.The equatorial diameter is the measurement around the equator, whereas the polar diameter is from pole to pole. This shows that Mars is an oblate spheroid.
A 'metal pole' could be made out of so many different types of metal, but most likely the metals you are looking for are Iron, Steel or a Chrome-plated pole.