Draw a perpendicular line from the top left vertex of the parallelogram to the base.
So...we have a right triangle with a leg of 5.6 in and a hypotenuse of 10 in
The sine of the angle at the bottom left vertex = 5.6 / 10
And since we have a parallelogram, the angle at the top right vertex is the same, so its sine is the same
So...using the Law of Sines we have
9.8/ sin (90) = h / (5.6 / 10 )
9.8 = 10h / 5.6 rearrange as
9.8 * 5.6 / 10 = h = 5.488 in