Răspunsuri

2014-11-18T20:14:57+02:00
A/3=b/4=c/5=K
a/3=k⇒a=3k
b/4=k⇒b=4k
c/5=k⇒c=5k
P=36⇒a+b+c=36
3k+4k+5k=36
12k=36
k=36:12
k=3⇒a=3*3=9,b=4*3=12,c=5*3=15
formula lui Heron ne ajuta sa aflam aria si anume
A=√p(p-a)(p-b)(p-c) unde p=P/2=36/2=18
A=√18(18-9)(18-12)(18-15)=√18*9*6*3=√2916=54