View Solution !ABC C2 View Solution Exams IIT JEE NEET UP Board Bihar Board CBSE Free Textbook Solutions KC Sinha Solutions for Maths Cengage Solutions for Maths DC Pandey Solutions for Physics HC Verma Solutions for Physics Sunil Batra Solutions for Physics ...
In a triangle ABC, ifa=2,b=3andc=4, thencosAis equal to View Solution In triangle ABC, let∠C=π/2. If r is the inradius and R is circumradius of the triangle, then2(r+R)is equal to View Solution Exams IIT JEE NEET
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=1/4(2c^2+2b^2-a^2) If r=b=c...
D The principle to remember here is that an exterior angle of a triangle--such as ∠ADB--is equal to the sum of the remote interior angles of the triangle, in this case ∠DBC and ∠DCB (=∠ACB) of triangle BDC. Thus, ∠DCB+∠DBC=4n, or ∠DBC=3n=45°, and therefore n=15°...
If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC , what is the area of triangular region RCS ? (1) The area of triangular region ABX is 32. (2) The length of one of the altitudes of triangle ABC is 8. 选项: 答案: A 提问列表...
In triangle ABC, side AB is perpendicular to side BC. If angle CAB is greater than 45 degrees, then which of the following could be the value of angle ACB? A.75° B.65° C.55° D.45° E.35° 显示答案 登录后才可以添加做题笔记哦,还没有账号? 马上注册 KMF 解析 网友解析 ...
If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC, what is the area of triangular region RCS ?(1)The area of triangular region ABX is 32.(2)The length of one of the altitudes of triangle ABC is 8. 选项: A、 Statement (1) ALONE...
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}}....
Triangle ABC lies in the first quadrant. Points A, B,and C are reflected across the line y=x to points A′, B′, and C′, respectively. Assume that none of the vertices of the triangle lie on the line y=x. Which of the following statements is not always true?( )...
Find the value of tan A, if area of Delta ABC is a^(2) -(b-c)^(2). 05:14 Prove that a^(2) sin 2B + b^(2) sin 2A = 4 Delta 04:45 Prove that ((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2c^2)=sin^2A 04:18 If the sides of a triangle are 17 , 25a n d...