tolong caranya 17,18,29,20 pliss

17. keliling = 22/7 x 2 x 21 = 132 cm
sudut = 22/132 x 360 = 60°
Luas = 22/7 x 21² x 1/6 = 231 cm²
jawaban : d

18. r² = 616x7/22 = 196
r = √196 = 14 cm
d = 2x14 = 28 cm
keliling = 22/7 x 28 = 88 cm

19. r = 88/2 x7/22 = 14
luas = 22/7 x 14² = 616 cm²

20. Keliling = 3,14 x 50 = 157 cm
jarak = 157 x 60/100 = 157 x 3/5 = 471/5 = 94,2 meter