perplexus.info :: Geometry : Copy and Construct

Copy and Construct (Posted on 2018-12-20)

ABCD is a quadrilateral with AD = BC, AB = 40, CD = 20 and ∠A + ∠B = 90. Find the area of the quadrilateral.

No Solution Yet Submitted by Danish Ahmed Khan

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re(2): Solution

| Comment 4 of 6 |

(In reply to re: Solution by armando)

ECD is not necessarily a 45-45-90 triangle. Angle EDC can be any value from 0 to 90. Your solution appears to hold only for this case.

Posted by Jer on 2018-12-20 21:53:45

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