Angles are measured in degrees with the symbol °. Angles can be labelled ... A three-quarter turn is 270°. An acute angle is less than 90°. An obtuse angle is between 90° and 180°.

You can show degrees using the symbol ° after the number of degrees ... 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 ...