Respuestas

2012-12-29T11:17:38+01:00

AB - BC=18

AB = 18 +BC

 

BC= X

AB= 18 +X

 

AC = AB + BC = 18 +X + X = 18 +2X

 

PA = PC = AC/2 = (18+2X)/2 = 9+X

 

PB= AB - PA = 18 +X - (9+X) = 18 +X -9 -X = 9

 

PB = 9