Lewis structure. The Lewis structures, also called Lewis-dot diagrams or electron dot diagrams are pictures that show the bonding between a pair of electrons and the atoms of a molecule. Each dot represents one electron. Two dots side by side represent a lone pair of electrons.
Right angles are like corners and measure 90Â°. Acute angles are smaller than 90Â°. Obtuse angles are larger than 90Â°, but less than 180Â°. And straight angles are 180Â°, which is where the two lines go in the same direction and become like a single straight line. And that's all there is to it: each of the four types of angles in mathematics.
Math Open Reference. Search >. data-ad-format=horizontal>. About these. ADVERTISEMENTS. Acute. In math, the word 'acute' refers to an angle less than 90Â°, or to a shape involving angles less than 90Â°. It is the opposite of obtuse, which refers to an angle greater than 90Â°. 1.Acute angle. Any angle with a measure less than 90Â°, for example: For more on this see Acute angle definition. 2. Acute triangle