In triangleABC, the expression (b^(2)-c^(2))/(asin(B-C)) + (c^(2)-a^2... 02:56 Free Ncert Solutions English Medium NCERT Solutions NCERT Solutions for Class 12 English Medium NCERT Solutions for Class 11 English Medium NCERT Solutions for Class 10 English Medium ...
In a triangle ABC, cos 3A + cos 3B + cos 3C = 1 , then then one angle must be exactly equal to View Solution Doubtnut is No.1 Study App and Learning App with Instant Video Solutions for NCERT Class 6, Class 7, Class 8, Class 9, Class 10, Class 11 and Class 12, IIT JEE pre...
In a triangle ABC, angle A = 60 degrees, angle B = 70 degrees. What is the measure of angle C? A. 50 degrees B. 60 degrees C. 70 degrees D. 80 degrees 相关知识点: 试题来源: 解析 A。三角形内角和是 180 度,已知角 A 和角 B 的度数,那么角 C 的度数为 180 - 60 - 70 =...
百度试题 题目Given BC=1,in a triangle(三角形)ABC, then the range of length of the side AB (or AC) is___。 相关知识点: 试题来源: 解析 略 反馈 收藏
Point P lies in the plane of the triangle. By setting , and , show that . 答案 so Similarly and Hence 相关推荐 1In a triangle ABC, the points D, E and F are the midpoints of AB, BC and CA respectively. Point P lies in the plane of the triangle. By setting , and , show...
解析 三角形BDE,三角形EDC,三角形AEC;三角形ADC,三角形BEC. 由BD=DC,且AE=ED,有{{S}_{\triangle ABE}}={{S}_{\triangle BDE}}={{S}_{\triangle EDC}}={{S}_{\triangle AEC}},从而有{{S}_{\triangle ABD}}={{S}_{\triangle ADC}}={{S}_{\triangle BEC}}....
In triangle ABC, BM is the median on AC. AE and AF trisect BC and meet BM at G and H, respectively. BG:GH:HM=x:y:z. Find the value of x+y+z, where x, y, and z are positive integers relatively prime. ( ) A. \number{10} B. \number{9} C. \number{8} D. \number...
In triangle ABC, AB=13, BC=14, and CA=15. Distinct points D, E, and F lie on segments \overline{BC}, \overline{CA} and \overline{DE} respectively, such that \overline{AD}\bot\overline{BC}, \overline{DE}\bot\overline{AC}, and \overline{AF}\bot \overline{BF} The length of ...
B 号 C D m 号 A C Let ABC = 0. Using the cosine rule in △ABD and △ABC: cos 0= 2() 2ac ac 2ac ∴2(c^2+(a^2)/4-m^2)=a^2+c^2-b^2 ∴2c^2+(a^2)/2-2m^2=a^2+c^2-b^2 ∴4c^2+a^2-4m^2=2a^2+2c^2-2b^2 ∴4m^2=2c^2+2b^2-a^2 ∴m...
( )2.In the triangle ABC,AC is parallel to(平行于)DE,DF is parallel to GH.Whichof the following statements is true? A.Angle(角)BHG is smaller than angle BFD. B.Angle BGH is equal to(相等)angle BDF. C.Angle BAC is larger than angle BDE. D.Angle DEB is larger than angle ACB....