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 =...
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 = 60°,并...
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....
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
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Cancelling 13, we obtain DF= \dfrac{16}{5}, so our answer is 16+5=\boxed{21~\rm(B)}.Using the similar triangles in triangle ADC gives AE= \dfrac{48}{5} and DE= \dfrac{36}{5}. Quadrilateral ABDF is cyclic, implying that \angle B+\angle DFA= 180^{\circ}. Therefore, \...
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!
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: ...
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, ∠A is 10 degrees greater than ∠B, and ∠B is 10 degrees greater than ∠C. The value of angle B is _出国考试答疑器_GMAT_试题_Problem Solving