Respuesta :

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
Ver imagen jdoe0001

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