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2r+2x+2y=a+b+c
r+x+y=a/2+b/2+c/2
r+c=a/2+b/2+c/2
r=(a+b-c)/2
DANE:
r=2cm
c=10cm
OBL a,b
ROZWIAZANIE
r=(a+b-c)/2
a²+b²=c² dwie niewiadome i dwa rownania
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a+b-c=4→a+b=14→a=14-b
a²+b²=100
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196-28b+b²+b²=100
2b²-28b+96=0
b²-14b+48=0
Δ=196-192=4 √Δ =2
b1=(14-2)/2=6
a1=14-b1=14-6=8
b2=(14+2)/2=8
a2=14-b2=14-8=6
ODP
przyprostokatne to 6cm i 8cm