A quadrilateral ABCD. The points BCD form an equilateral triangle. If AB=u; AD=v and Angle BAD= theta, prove that the area of the quadrilateral is thanks as always!
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Originally Posted by BabyMilo A quadrilateral ABCD. The points BCD form an equilateral triangle. If AB=u; AD=v and Angle BAD= theta, prove that the area of the quadrilateral is thanks as always! let using the cosine law ... area of triangle BCD ... area of triangle ABD ... area of quad ABCD = can you finish from here?
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