Diketahui AF = 5 cm, AC = 13 cm, CE = 8 cm. Panjang BE adalah.... Tolong jawab yaaa besok harus dikumpuk :

Mapel : Matematika
Bab : Kesebangunan

AF = 5 cm
AC = 13 cm
CE = 8 cm
DE = CE = 13 cm - 5 cm = 8 cm

        AC / DE = BE + CE / BE
13 cm / 8 cm = BE + 8 cm / BE
  13 cm x BE = 8 cm ( BE + 8 cm )
            13BE = 8BE + 64 
  13BE - 8BE = 64 cm
              5BE = 64 cm
                BE = 64 cm/5
                BE = 12,8 cm

ED/AC = BE / BC
(AC - AF)/AC = BE / (CE + BE)
(13 - 5)/13 = BE/(8 + BE)
8/13 = BE/(8 + BE)
8(8 + BE) = 13 BE
64 + 8 BE = 13 BE
13 BE - 8 BE = 64
5 BE = 64
BE = 64/5
BE = 12,8 cm ✔