yang no 70 ya...beserta caranya...terimakasih

L persegi pjg ABCD
= 24 x 13
= 312 cm²

L ΔCDF
= ½ at = ½ (27) (7) = 84 cm²

L ΔADE
= ½ at = ½ (14) (13) = 91 cm²

L ΔBEF
= ½ at = ½ (10) (6) = 30 cm²

L ΔDEF
= L persegi pjg ABCD - (L ΔCDF + L ΔADE + L ΔBEF)
= 312 - (84 + 91 + 30)
= 312 - 205
= 107 cm²

Panjang DF
= √CD² + CF²
= √24² + 7²
= √576 + 49
= √625
= 25 cm

L ΔDEF = ½at
t = (L ΔDEF)/(½a)
t = 107/(½DF)
t = 107/(½ 25)
t = 107/12,5
t = 8,56 cm

Jawaban C