Job Recruitment Website - Job information - (20 13? As shown in the figure, the acute angle △ABC is inscribed in ⊙O, ∠ A = 30, ∠ ACB > 90, BC=2, and the tangent BP of ⊙O passing through point B is at point D.
(20 13? As shown in the figure, the acute angle △ABC is inscribed in ⊙O, ∠ A = 30, ∠ ACB > 90, BC=2, and the tangent BP of ⊙O passing through point B is at point D.
Solution: connect OB,
∵BP is the tangent of⊙ O,
∴OB⊥BD,
That is ∠ OBD = 90,
∫∠A = 30,
∴∠BOC=2∠A=60,
OB = OC,
∴△OBC is an equilateral triangle,
∴OB=OC=BC=2,
∴BD=OB? tan60 =23,
∴S shadow =SRt△OBD-S sector OBC =12× 2× 23-60360× π× 22 = 23-23 π.
So the answer is: 23-23 π.
- Previous article:Shijiazhuang furniture city
- Next article:List and deeds of moral model figures in Qingdao in 2009
- Related articles
- Does Chongqing Tea Garden Midea Air Conditioning Factory stand all day?
- Is there a nanny in Fugu now?
- Puyang life insurance company
- 304 Spring Steel Wire Viscose Water Fracture
- Where are the anchors of Simba Film and Television Media Company in Luoyang Old Town broadcast live? Please elaborate.
- The scale of Meixian Second People's Hospital
- Is it easy for Shandong Water Conservancy Vocational College to find a job?
- How is the company, Wuhu Delphi Park? Which company is better than mainland automotive electronics? Refers to front-line operators.
- Shanghai yuyin teahouse co., ltd. recruitment information, how about Shanghai yuyin teahouse co., ltd.
- What Japanese companies are there in Weihai?