tolong ya tugas nya di kmpl bsk

V = 400 cm³
t = 12 cm

a.
V = 1/3.LA.t
400 = 1/3.LA.12
400 = 4.LA
400/4 = LA
100 cm² = LA

b.
LA = s²
100 = s²
10 cm = s

c.
Tinggi limas = TO = 12 cm
panjang rusuk alas = AB = 10cm
OB = 1/2 . AB = 1/2.10 = 5 cm
tinggi segitiga = TP 
TP² = TO² + OB²
TP² = 12² + 5²
TP² = 144 + 25
TP² = 169
TP = 13 cm

d.
L = 1/2. a.t
L TBC = 1/2. BC.TP
           = 1/2.10.13
           = 65 cm²

e.
LP = LA + 4.LΔ
     = 100 + 4.65
     = 100 + 260
     = 360 cm²