Using sides AB and BC of square ABCD, two congruent isosceles triangles △AMB and △BKC were constructed. AB and BC are the bases of these triangles (see figure). Find m∠MKB, in degrees.

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters