math
posted by ana on .
The sides of a parallelogram are 15 ft and 17 ft. One angle is 40° while another angle is 140°. Find the lengths of the diagonals of the parallelogram (to the nearest tenth of a foot)

for the long diagonal
LD^2 = 15^2 + 17^2  2(15)(17)cos140°
solve for LD
let me know what your equation is for the short diagonal. 
one side of a parallelogram is 10 inches long and makes angle 45 and 60 with short diagonal and the other side respectively. Find the length of the other side.?