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R = 2/3h
R = 2/3*a√3/2
R = a√3/3
R = 10√3/3
R = 3⅓√3
b)
r = 1/3h
r = 1/3*a√3/2
r = a√3/6
r = 5√3/6
r = ⅚√3
r = 2/3h
r = 2/3 * a√3/2
r = a√3 / 3
r = 10/3 √3
Długość okręgu
l=2πr=2 * 10/3 √3 * π = 20/3 √3π = 6i2/3 √3π
b)
r = 1/3h
r = 1/3*a√3/2
r = a√3/6
r = 5/6 √3
Długość okręgu
l=2πr=2 * 5/6 √3 * π = 5/3 √3π = 1i2/3 √3π