Răspuns:
a/b=3/4, 4*a=3*b, a=(3/4)*b
a+b+c=84
c²=a²+b², c²=(9/16)*b²+b², c²=(25/16)*b², c=√[(25/16)*b²]
c=(5/4)*b
a+b+c=84
(3/4)*b+b+(5/4)*b=84,
(3/4)*b+(4/4)*b+(5/4)*b=84
(12/4)*b=84
3*b=84
b=84/3=28
a=3*28/4=21
c=5*28/4=35
Aria=a*b/2=28*21/2=14*21=294
Aria=c*înălțimea/2=294
înălțimea=294*2/35=42*2/5=84/5
Răspuns corect B) 84/5
