Дано : ∠BDC = 45°; ∠CDN = ∠BDC : 3
Найти : ∠BDN
∠CDN = ∠BDC : 3 = 45° : 3 = 15°
∠BDN = ∠BDC + ∠CDN = 45° + 15° = 60°
ответ : 60°
Дано : ∠BDC = 45°; ∠CDN = ∠BDC : 3
Найти : ∠BDN
∠CDN = ∠BDC : 3 = 45° : 3 = 15°
∠BDN = ∠BDC + ∠CDN = 45° + 15° = 60°
ответ : 60°