The angles of a quadrilateral ABCD are angle A = 30°, angle B = 60°, angleC = 75°. What is the measure of angle D ? State whether the quadrilateral is concave or convex.
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The angles of a quadrilateral ABCD are angle A = 30°, angle B = 60°, angleC = 75°. What is the measure of angle D ? State whether the quadrilateral is concave or convex.
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