This is also an SAS triangle. First of all we will find r using The Law of Cosines: r2 = p2 + q2 − 2pq cos R r2 = 6.92 + 2.62 − 2 × 6.9 × 2.6 × cos(117°) r2 = 47.61 + 6.76 − 35.88 × cos(117°) r2 = 54.37 − 35.88 × (−0.4539...) r2 = 54....
"SAS" 的意思是 "(S)ide, (A)ngle, (S)ide"(英语 "Angle" 的意思是 角,"Side" 的意思是 边)"SAS" 的意思是我们知道两个边长和这两边之间的角度。解SAS 三角形用余弦定理 来求未知的边长, 用正弦定理 来求较小的未知角度, 然后用 三个角的和是 180° 来求剩下的角度。例1 在这三角形,我们...
For this type of triangle, we must use The Law of Cosines first to calculate the third side of the triangle; then we can use The Law of Sines to find one of the other two angles, and finally use Angles of a Triangle to find the last angle. See Solving "SAS" Triangles ....