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 =...
4. In triangle ABC the bisector of angle BCA intersects the circumcircle again at R, the per-pendicular bisector of BC at P, and the perpendicular bisector of AC at Q. The midpoint of BC is K and the midpoint of AC is L. Prove that the triangles RPK and RQL have the same area....
Example 2: In triangle ABC, angle BAC = 60°, and BC = AB. What is the measure of angle BCA? 相关知识点: 试题来源: 解析 解析: 根据题目中给出的信息,我们需要求解角BCA的度数。 根据三角形内角和定理,三角形ABC的三个内角之和等于180度,即角BAC + 角ABC + 角BCA = 180°。 已知角BAC...
Step by step video, text & image solution for In a triagnle ABC, angle B=pi/3 " and " angle C = pi/4 let D divide BC internally in the ratio 1:3 .Then (sin (angle BAD))/((Sin (angle CAD)) is equal to by Maths experts to help you in doubts & scoring excellent marks in...
In a triangle ABC , let∠C=π2. If r is the in-radius and R is the circum-radius of the triangle , then 2 (r + R) is equal to View Solution The vertices of triangle ABC are A (4, 4), B (6, 3), C (2, -1), then angle ABC is equal to ...
In a triangle ABC the angle C is three times the size of angle A, the angle B is twice the size of angle A. Then the triangle ABC A. is equilateral B. is isosceles C. has an obtuse angle D. has a right-angle E. has only acute angles 相关知识点: ...
We can find anunknown anglein aright-angled triangle, as long as we know the lengths oftwo of its sides. Example The ladder leans against a wall as shown. What is theanglebetween the ladder and the wall? The answer is to useSine, Cosine or Tangent!
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?( ) A. Tiangle ...
In triangle ABC, the angle ACB is greater than a right angle. Let D be the foot of the perpendicular from C to AB,let M be the midpoint of AB,let E be the point on AC(extended)such that EM=BM,and let F be ...
In triangle ABC, side AB has length 8 cm, side BC has length 7 cm and side AC has length 6 cm.Find the size of angle ABC. 相关知识点: 试题来源: 解析 46.6° cos A = (b^2+c^2-a^2)(2bc)cos x = ((7)^2+(8)^2-(6)^2)(2(7)(8))cos x = (11)(16)x = cos^-...