no 12-16 pakai caranya plissss, itu besok di kumpulkan

12.
MKN = (180-52)/2 = 128/2 = 64°

13.
AOB = 32/24 x 42 = 4 x 42/3 = 4 x 14 = 56°

14.
LM = 17p/12p x 18 = 17x3/2 = 51/2 = 25,5 cm

15.
AOB = (180-51)/51 x 34 = 129/3 x 2 = 43 x 2 = 86 cm²

16.
r = 10/√2 = 10/2(√2) = 5√2 cm

Lj = 3,14 x (5√2)² = 3,14 x 50 = 157 cm²
K = 3,14 x 2 x 5√2 = 31,4√2 cm