Pls help it’s a test. Solve for the missing side length. Round to the nearest tenth.
х
40°
20

x=20

Step-by-step explanation:

If there is a 90° angle, that means the 2 sides connecting it must be the same. Therefore, side x is equal to 20 since it is equal to the other side connecting the angle.

The complete question is shown below. As you can see, we know that:

Shapes are congruent if you can turn one into the other by moving, rotating or flipping. If any two triangles have matching side lengths, they're not necessarily congruent. The same happens if they have two matching side lengths, but If triangles have three matching side lengths, then they must be congruent. This is is known as the Side-Side-Side Postulate (SSS). Since in this problem corresponding sides measures the same, therefore we can say that the postulate that applies is:

B. Congruent - SSS