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b) 30cm
c) 9cm
a)
2dm=20cm
a²+b²=c²
20²+5²=425cm²
c=√425cm
b)
100mm=10cm
a²+b²=c²
25²+10²=725cm²
c=√725cm
c)
8cm=80mm
a²+b²=c²
80²+16²=6656mm²=66,65cm²
c=√6656mm
a²+b²=x²
20²+5²=x²
x²=√425cm
x=5√17
b)
100mm=10cm
a²+b²=x²
25²+10²=x²
x²=√725cm
x=5√29
c)
8cm=80mm
a²+b²=x²
80²+16²=x²
x²=√6656mm