jawab no 22,23,24 pake caranya

22.
30/21 = 20/ST
ST = 21x20/30 = 14 cm

23.
A + B + C = 180°
4x +10 + 5x -30 + 6x -40 = 180
15x = 180 +60
x = 240/15 = 16

C = 6(16)-40 = 56°

24.
Luas = 26x20/2 = 260 cm²