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h=7cm
d podstawy=a√2=4√2cm
D bryły z pitagorasa=√7²+(4√2)²=√49+32=√81=9cm=szukana przekatna
d=4√2
7² + (4√2)² = x²
49 + 32 = x²
81 = x ²
x=√81
x=9
Przekątna ma długosc 9 cm.