Jawab:
19. a. 20
20.b. 90
Penjelasan dengan langkah-langkah:
19. ∠AOC = 2 x ∠ABC = 2 x 60 = 120
∠BOD = 2 x ∠BCD = 2 x 40 = 80
∠AEC = = = 20
20. digambar
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Jawab:
19. a. 20
20.b. 90
Penjelasan dengan langkah-langkah:
19. ∠AOC = 2 x ∠ABC = 2 x 60 = 120
∠BOD = 2 x ∠BCD = 2 x 40 = 80
∠AEC =
= 
= 20
20. digambar