A half turn is 180° and is known as a straight angle (or angle on a straight line). A three-quarter turn is 270°. An acute angle is less than 90°. An obtuse angle is between 90° and 180°.

You can spot right angles in doors, books or the edge of a piece of paper. An acute angle is less than 90°. It might look small and sharp, like the corner in a slice of pizza. An obtuse angle is ...

The use of bisphosphonates, particularly risedronate, in patients with osteoporosis is linked to a higher risk for acute angle closure but not open-angle glaucoma. Researchers conducted a ...