FIELD: equipment of sports grounds. SUBSTANCE: backboard has the form of a segment with a radius of 90-37 cm and the center located 10± 0,5 cm from chord axis. Reference area is marked by two arcs with a radius of 29.5 and 24.5 cm and the center at the upper edge of basket ring. Digital marks are written between arcs. EFFECT: improved design. 3 cl, 4 dwg
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