Question 322449
I know that this is a geometry question but it can be solved using trigonometry.
We use the law of sines.

The sum of the angles of a triangle is 180 degrees.

To find the missing angle, add 51 + 75 and then subtract the sum from 180.
This will give you 54 degrees.

We now use the law of sines.

Let x = the missing side we want to find

sin51/x = sin75/25

x(sin75) = sin51(25)

x(sin75) = 19.42864904

x = 19.42864904/sin75

x = 20.11401756

The side opposite the smallest angle is 20 inches.