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2x×5x=160
10x²=160
x²=160:10
x²=16
x=4
boki podstawy:
2x=8cm
5x=20cm
d podstawy=√20²+8²=√464=4√29
½d=2√29
krawędź boczna=4√29
h=a√3:2=2√29√3:2=√87
v=⅓×160×√87=53⅓√87cm³