Q: How did they measure the diameter or radius of earth?

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The radius of a circle is half the diameter.

If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.

You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).

The radius is half the diameter. Draw a line that passes through the centre of the circle and measure it. This is the diameter. Halve it and you will have the radius.

That depends on its diameter or radius

Related questions

The radius of a circle is half the diameter.

Europa: 1561 km radius Earth: 6371 km radius The diameter is twice the radius.

14 inches radius = 1/2 the diameter diameter = 2 x radius

If you have a physical cylinder to measure, measure the "width" of the circle that is the cross section of the cylinder. That is the diameter, Half the diameter is the radius.

The mean diameter of Earth is 12,742 kilometers or 7917.5 miles.More specifically, if we quote the accurate values for the radius, it changes depending on where you measure it.Mean radius 6,371.0 km = 3958.8 milesEquatorial radius 6,378.1 km = 3963.2 milesPolar radius 6,356.8 km = 3949.9 miles

24 meters diameter is simply twice the radius.

If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.

24 meters diameter is simply two times the radius.

The radius of a circle is 1/2 of its diameter

You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).

The radius is half the diameter. Draw a line that passes through the centre of the circle and measure it. This is the diameter. Halve it and you will have the radius.

You can measure the diameter, then divide that by 2.