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Faizan
While adjustable basketball goals are manufactured to allow players to change the height of the rim, there's one standard height for all levels of organized play: The rim should be 10 feet off the ground. This was the height originally set when James Naismith tacked up peach baskets at two ends of a gymnasium in Springfield, Mass., in 1891, and it's the same height at which Kobe Bryant dunks over his opponents on a steel rim in today's game. There are a couple of methods you can use to make sure you're playing the game with the regulation rim height.
Set the ladder below and just to one side of the basketball rim.
Climb the ladder and lay a yardstick across the rim so that there's an obvious midpoint on the yardstick from one side of the rim to the other. The diameter of a rim is 18 inches, so you can, for example, set the 3-inch mark on the yardstick on one side of the rim and the 21-inch mark on the other. The distance between the two marks must be 18 inches to ensure that you're measuring the diameter correctly. The midpoint in this scenario would be the 12-inch mark, since it's 9 inches from both sides.
Measure the distance from the 12-inch mark on the underside of the yardstick to the ground using the tape measure and the help of your assistant. This will give you the exact height. Although it would seem possible to simply measure from one side of the rim, regulations state that the height must be measured at the center of the goal.
Using a Plumb Bob
Attach an 11-foot piece of string to a plumb bob.
Set the yardstick across the rim in the same manner as above.
Hold the unattached end of the string to the midpoint mark on the underside of the yardstick and drop the other end with the plumb bob. Pull the string up until the bottom of the plumb bob is just making contact with the ground.
Mark the point on the string where it touches the midpoint of the yardstick.
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Measure the string from the mark you made to the end of the plumb bob to get the height of the rim.
Set the ladder below and just to one side of the basketball rim.
Climb the ladder and lay a yardstick across the rim so that there's an obvious midpoint on the yardstick from one side of the rim to the other. The diameter of a rim is 18 inches, so you can, for example, set the 3-inch mark on the yardstick on one side of the rim and the 21-inch mark on the other. The distance between the two marks must be 18 inches to ensure that you're measuring the diameter correctly. The midpoint in this scenario would be the 12-inch mark, since it's 9 inches from both sides.
Measure the distance from the 12-inch mark on the underside of the yardstick to the ground using the tape measure and the help of your assistant. This will give you the exact height. Although it would seem possible to simply measure from one side of the rim, regulations state that the height must be measured at the center of the goal.
Using a Plumb Bob
Attach an 11-foot piece of string to a plumb bob.
Set the yardstick across the rim in the same manner as above.
Hold the unattached end of the string to the midpoint mark on the underside of the yardstick and drop the other end with the plumb bob. Pull the string up until the bottom of the plumb bob is just making contact with the ground.
Mark the point on the string where it touches the midpoint of the yardstick.
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How to Measure the Free Throw Line to the Hoop Regulation Basketball Height
Measure the string from the mark you made to the end of the plumb bob to get the height of the rim.
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