paint
It depends on which basketball court you are talking about. The NBA and FIBA paint is 16 feet wide. The NCAA paint is 12 feet wide.
the paint is the box(rectangle) from the backboard to the free throw line
In the paint
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12 feet wide
the paint, or the key
This will depend on which paint you are talking about. There is paint near the end zones and some around the free throw lines.
Because the in international basketball it is the shape of an old style key hole
3 seconds
Seven shots in the paint means, seven shots on the basketball court.
You take some paper or cardboard then you paint it to make it like a basketball court.