tolong yaa kak..............

21.
BC² = AB² + AC²
BC² = 15² + 20²
BC² = 225 + 400
BC² = 625
BC = √625
BC = 25 cm

1/2 x AB x AC = 1/2 x AD x BC
1/2 x 15 x 20 = 1/2 x AD x 25
15 x 20 = 25AD
300 = 25AD
AD = 300 / 25
AD = 12 cm

jawaban D

22.
ED / EB = AE / CE
ED / 4 = 6 / 8
ED / 4 = 3/4
ED = 3/4 x 4
ED = 3 cm

jawaban A