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H^2 =a^2+b^2
Triangulo A
5cm^2 =a^2+4^2
25 =a^2+16
a^2=25-16
a^2=9
a=√9
A=3 el primer triangulo el valor del lado desconocido es 3 cm
Triangulo B
15cm^2 = a^2 + 9^2
225=a^2+81
a^2=225-81
a^2=144
a= √144
a=12 el lado del triangulo equivale a 12cm
Espero te ayude saludes manueldoctor16