一、填空题(每空4分,共40分) 1.Rt△AB~:中,口:3,么A=2么B.贝Ⅱ6=——.2.sin30。+cos60。+tg45。=——.3.正三角形的内切圆与外接圆面积之比为4.已知oO的直径AB=10,P是OA上一点,弦MN过点P,且.AP=2.MP:2√2.则弦心距0Q=——. 5.如图,两个以0为圆心的同心圆,AB切大圆于B,AC切小圆 First, fill in the blanks (4 points per empty, a total of 40 points) 1.Rt △ AB ~: in, mouth: 3, what A = 2 what B. shell II6 = -.2.sin30. +cos60. +tg45. =——.3. The ratio of the inscribed circle of the equilateral triangle to the area of ​​the circumscribed circle is 4. The diameter of the known oO is AB=10, P is the point on the OA, the string MN crosses the point P, and .AP=2.MP: 2√2. The chord center distance is 0Q=——. 5. As shown in the figure, two concentric circles centered on 0, AB cut big circle on B, AC cut small circle