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0,9dm=9cm
9cm +31cm=40
9²+40²=c²
81+ 1600=c²
1681=c²
41=c
b)
25%=¼
80mm=8cm
8 x ¼=2cm 8-2= 6cm
8²+6²=c²
64+36=c²
100=c²
10=c
9²+40²=c²
c²=√1641
c=41
80 mm- 8 cm
8²+6²=c²
c²=√100
c=10