An Obtuse angle is more than 90° but less than 180°. Real life examples would be fans, and most rooftops of houses and buildings.
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people playing sports-angle of legs, arm, ect
the peak of a roof often forms an obtuse triangle.
Well, there is a fan. It has an obtuse angle. Or a diamond. Hope this helped! ~GMP
blinds or window panes
One example I know is an ice cream cone.