The measure of the are from B to A not passing through C. i 30 degrees С
1. What is the measure of angle B04?
2. What is the measure of angie BDA?
3. What is the measure of angle BCA?

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.