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geometry intermediate

Problem

Sides and of convex polygon have lengths 3, 4, 12, and 13, respectively, and is a right angle. The area of the quadrilateral is
problem
(A)
(B)
(C)
(D)
Solution
Connect C and A, and we have a 3-4-5 right triangle and 5-12-13 right triangle. The area of both is .
Final answer
B