A circle is a figure that has a round shape with no corners and edges. A full circle has 360 degrees. There are so many ways to draw a circle like:
No, it is not. An angle in geometry is when two lines meet and share the same point. They measured in degrees. There are five types of angles. First, an acute angle that had an angle between 0 and 90 degrees. Second, the right angle, it had 90 degrees angle. Third, an obtuse angle that had an angle between 90 and 180 degrees. The fourth angle called a straight angle that had 180 degrees angle. Also, a reflex angle that had an angle between 180 and 360 degrees. You can also measure an angle with a 360-degree chart protractor.
First, you need to align your protractor with the angle that you wanna measure. Stack it then you need to move and align the center of the protractor with the center point of the angle. One line of the angle must be on 0 angles of the chart. See where other lines get stacked with angle chart and that you can see your angle degrees.
It has a very long history. It comes at the same time as when the wheel was invented about 6000 years ago. It comes from Mesopotamia people who loved the number 60 so much. They loved it because it was very easy to divide this number. They use this number in every aspect like in early mathematics and early trade. This knowledge passed to ancient Egyptians. With that knowledge, they divide a circle into 360 degrees, and from this, we can get so many great inventions like calendar and time measurement.