What is the maximum number of obtuse angles that a quadrilateral can have?

A quadrilateral is a closed shape that has four sides, four vertices, and four angles.

It's made by connecting four non-collinear points.

We know that the sum of all the angles of a quadrilateral is 360^∘. 

Also, an obtuse angle is more than 90^∘ and less than 180^∘. 

Thus, all the angles of a quadrilateral cannot be obtuse.
Hence, at the most 3 angles can be obtuse. 

Example: The below figure has three obtuse angles and one acute angle.