The figure below shows a
quadrilateral ABCD, angle ACB = 10 degrees, angle ADB = 20
degrees, angle BDC = 30 degrees, and angle BAD + angle ACD =145.
Find angle BAC. This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.
See
also:
Triangles
Quadrilaterals
Angles
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