Two figures are congruent means they are equal in measure
all angles and sides are congruent.
so those are not labeled u can find them by looking into another figure
∠A=133°,∠M=86,∠L=41
∠B =∠K so they are angles of quadrilateral
sum of these shapes are 360.
133+86+41+x=360
x=100
∠B=∠K=100°