tolong bantu jawab....

Cari panjang BC pake phytagoras
BC² = 13² - 5²
BC² = 169 - 25
BC² = 144
BC = 12 cm

La = a.t/2
     = 5 . 12/2
     = 30 cm²

   V = La.t
375 = 30.t
     t = 12,5 (B)