Question

Tolong ya beserta caranya...yang dua ini aja

Answer 1

11. diket, ceb : dec = 8:5

cbe = 180 - 130 = 50
bed = 180 - cbe - cde
bed = 180 - 50 - 78
bed = 52°

dec = 5/(8+5) x 52
dec = 5/13 x 52
dec = 20°

ecd = 180 - 78 - 20
ecd = 82°

12. bca = 180 - 98
bca = 82

abc = 180 - 82 - 47
abc = 51

selisih = abc - cab
= 51 - 47
= 4°