A parallelogram has side lengths of 13 and 17 and an angle that measures 64°.
What is $x$, the length of the diagonal, to the nearest whole number?
(Use the Law of Cosines: $a^2=b^2+c^2-2 b c \cos (A)$)
A21
B19
C18
D16
What is $x$, the length of the diagonal, to the nearest whole number?
(Use the Law of Cosines: $a^2=b^2+c^2-2 b c \cos (A)$)
A21
B19
C18
D16