Please excuse my sloppy writing but the answer is 30
Let P be a point outside the circle such that triangle LMP has legs coincident with chords MW and LK (i.e. M, W, and P are colinear, and L, K, and P are colinear). By the intersecting secants theorem,

The angles in any triangle add to 180 degrees in measure, and
and
, so that


Answer:
b
Step-by-step explanation:
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Area=6x10=60 feet as it is rectangle so all angles are 90° and oppossite sides are equal