Tolong jawab no 6 yaa

Materi : segitiga dan segiempat
Kelas : 7 SMP

6.
a)
L ∆ABC = 1/2 × AB × t
= 1/2 × 6 × 6 cm²
= 18 cm²

b)
L ∆ABC = 1/2 × BC × AD
18 cm² = 1/2 × 10 cm × AD
18 = 5 AD
AD = 18/5
AD = 3,6 cm