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α = 45 stopni
r = ?
r = 1/2h
h/a = sin 45 stopni
h = a*sin 45 stopni
h = 20 cm*√2:2 =10√2 cm
r = 1/2h
r = 1/2*10√2 cm
r = 5√2 cm
odp. r = 5√2 cm