The two figures below are congruent. find the measure of the spot not labeled on both figures.

Since the shapes are congruents, then, their sides and angles are also equal, check the picture below

now.... what are the angles of K and B?  well... we dunno

but you have all other angles, notice, there are 4 sides, all internal angles add up to 360, so.. just    A + B + C + D = 360  <--- solve for B

keep in mind K = B

Step-by-step explanation:

The two xs are contained in the same triangle.

Every triangle has 180 degrees.

2*x + 90 = 180                  Subtract 90 from each side

2x +90 - 90 = 180 - 90

2x = 90                             Divide by 2

2x/2 = 90/2

x = 45