In the center of the baseline, you will see a 'black dot surrounded by a circle.' In order to measure an angle, place this area directly over the VERTEX and line up the bottom line with the zero on the far left side. It looks familiar, doesn’t it? This ruler is what we will use to make straight lines and it also helps measure the angle openings. Look at the bottom straight edge(.)We call this the 'baseline'. While we measure Nia’s first turn, let’s take a look at the parts of a protractor. Can you point to the opening, or arc, of each angle? This is the area we need to measure to know what type of angle we have. Angles can be acute(.), right,(.)obtuse(.), or straight(.) depending on the opening size. We name the angles by how wide the opening of the ARC is and measure these in degrees. Remember, angles are made by two lines that meet at an endpoint, called the VERTEX.

: 'Angles and Measuring Angles' Nia's turns will be measured by the angles they create. We can track her progress by using a special tool called a PROTRACTOR.

Nia found a skateboard in the attic and is learning how to do some cool tricks! She is practicing making turns with the board.