Solve the following triangles, in which

- 2.
- Find the smallest angle of the triangle , when .
- Find the measure of the greatest angle, if sides of the triangle are .
- The sides of a triangle are and . Prove that the greatest angle of the triangle is .
- The measures of side of a triangular plot are 413,214 and 375 meters. Find the measures of the corner angles of the plot.
- Three villages and are connected by straight roads and . What angles these roads make with each other?