Law of Cosines: A parallelogram has sides of lengths 9 and 4, and one angle is 39°. What is the length of smaller diagonal? What is the length of longer diagonal?

Question

Answer should be entered as a number, accurate to three decimal places.

Answer 1

Use 4, 9, and cosine 39° in Law of Cosines for smaller diagonal.

Use 4, 9, and cosine 51° in Law of Cosinse for larger diagonal