a, b, c;
a + b + c = 62 m;
a = b + 12;
b = 2 c
//____c______//____c_____//
b = 2c;
//______c____//____c_____//.....12 cm.....//
a = b + 12 = 2c + 12;
//_____c_____//
a + b + c = 2c + 2c + 12 + c = 5c + 12;
5c + 12 = 62;
5c = 62 - 12;
5c = 50;
c = 50 : 5;
c = 10 m ;
b = 2 x 10;
b = 20 m;
a = 20 + 12;
a = 32