Mathematics · Geometry
In a standard 'boomerang' or 'arrowhead' quadrilateral (non-convex quadrilateral) with interior angles b, c, and d at the three sharp tips, and an exterior reflex angle at the remaining vertex, the interior non-reflex angle A at that vertex is given by which of the following relations?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A = a + b - c
- 2A = a - b + c
- 3A = a - b - c
- 4A = a + b + c✓
Correct answer
A = a + b + c
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