The common properties of polygons are a closed shape(no holes or intersections), a 2D shape, straight lines(no curved lines).
The measure of degrees in an angle tells me that the angle is ...
An acute angle which is less than 90°. An obtuse angle which is greater than 90° but less than 180°. A straight angle which is 180°. Lastly, 360° which is a full turn.
Some of the common angles are...
Some common angles are 90 °(right), 180°(straight), 270°, 360°, 0°.
Some strategies to estimate angle measures are...
Using the initial side and terminal side is kind of a strategy, how to use the initial side is that the initial side always equals zero degrees, and then the terminal side is the angle so you have to guess that as close as possible angle, which leads to my next strategy, common angles. Using common angles are so helpful, so if you have an acute angle, first I would like to add in the 90 degree angle line then try to guess the main angle just by seeing how far away it is from the common angle. Using a protecter is the best one of all, how to use a protecter to draw an angle is first you draw a vertex in the middle of the whole. Then, draw an initial side line along the zero line on the protecter from the vertex. Then line up the zero line and the vertex to the whole and zero line. Find the angle you want then mark where that is. Lastly, draw a line connecting the mark to the vertex.
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