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.
2 Â©2005abcteach.com Types of Angles! A right angle: Right angles ALWAYS measure 90 degrees and look like a perfect corner. A straight angle: Straight angles ALWAYS measure 180 degrees and are a straight line. An acute angle. Acute angles ALWAYS measure less than 90 degrees.