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6" . A STANDARD RECTANGULAR BACKBOARD IS 42" HIGH. THE TOP OF RIM IS 36" FROM THE TOP OF BACKBOARD, SO THAT LEAVES 6" FROM THE BOTTOM OF BACKBOARD TO TOP OF RIM.
You measure at the bottom of the meniscus.
The measurement of 10' refers to the distance from the rim to the ground.
From the hardwood floor to the top of the rim.
The height.
top to bottom
10 Feet from the ground to the top of the rim.
ground or base
With a tape measure. You asked. Outside to outside, top to bottom.
Top
you measure at the top. Typically, pie pans are 8 or 9 inches.