a, b - катеты, b=a+7
c^2=a^2+b^2 =a^2 +(a+7)^2 =2a^2 +14a +49
S=ab/2 =>
a(a+7)/2=60 <=> a^2 +7a =120 <=> 2a^2 +14a +49 =289 =>
c^2=289 <=> c=17
Или см. рис.
c^2 =4S+k^2
a, b - катеты, b=a+7
c^2=a^2+b^2 =a^2 +(a+7)^2 =2a^2 +14a +49
S=ab/2 =>
a(a+7)/2=60 <=> a^2 +7a =120 <=> 2a^2 +14a +49 =289 =>
c^2=289 <=> c=17
Или см. рис.
c^2 =4S+k^2