Răspuns :
Răspuns:
(147/2 ) cm²
Explicație pas cu pas:
x+3x=28
4x=28
x=7
aria =c1*c2/2=x*3x/2=7*21/2=(147/2 ) cm²
Răspuns:
AB+AC=28cm dar AB=3AC => AC+3AC= 28cm=>
=>4AC=28| :4=> AC=7cm si AB=21cm
ariaABC=(AB×AC):2=(7×21):2=147:2=73,5cm²
Explicație pas cu pas:
x+3x=28
4x=28
x=7
aria =c1*c2/2=x*3x/2=7*21/2=(147/2 ) cm²
Răspuns:
AB+AC=28cm dar AB=3AC => AC+3AC= 28cm=>
=>4AC=28| :4=> AC=7cm si AB=21cm
ariaABC=(AB×AC):2=(7×21):2=147:2=73,5cm²