Three strain gauges are mounted on the surface of a part. Gauge A is parallel to the x-axis and gauge C is parallel to the y-axis. The third gage, B, is at 30° to gauge A. When the part is loaded the gauges read: Gauge A 3000 x 10-6 Gauge B 3500 x 10-6 Gauge C 1000 x 10-6 Determine (a) value of Yxy (b) principal strains in the plane of the surface (c) Mohr's circle