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pozioma przyprostokatna =b
przeciwporostokatna=c
a+c=20m
b=6m
a=20m-c
z pitagorasa:
c²=a²+b²
c²=(20-c)²+6²
c²=400-40c+c²+36
c²=c²-40c+436
40c=436
c=436:40
c=10,9m
20m-10,9m=9,1m