∠COD = 2∠CAD berdasarkan Kasus 1, maka
β = ∠BOD - ∠COD
= 2 ∠BAD - 2∠CAD
= 2 (∠BAD - ∠CAD)
= 2α
2. Jika ∠BOC = 90° , berapakah besar ∠BEC?
Jawaban:
∠BEC = ½ ∠BOC
= ½ ∙ 90°
= 45°
∠COD = 2∠CAD berdasarkan Kasus 1, maka
β = ∠BOD - ∠COD
= 2 ∠BAD - 2∠CAD
= 2 (∠BAD - ∠CAD)
= 2α
2. Jika ∠BOC = 90° , berapakah besar ∠BEC?
Jawaban:
∠BEC = ½ ∠BOC
= ½ ∙ 90°
= 45°