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d2 = 8
D1 = 10
D2 - dłuższa przekątna graniastosłupa
z tw. Pitagorasa:
H²+d1² = D1² (H - wysokość graniastosłupa)
H²+6² = 10²
H² = 100-36
H² = 64
H = √64
H = 8
H²+d2² = D2²
D2² = 8²+8²
D2² = 64+64
D2² = 128
D2 = √128
D2 = 8√2