Question 346942
let first side be x

second side= = 2x

third side= 2x-4
...
x+2x+2x-4=76
5x-4=76
5x=76+4
5x=80
x=16 cm first side
second side = 2*16= 32 cm
third side = 2x-4 = 2*16 -4 =28 cm