KINDS IN ANGLES

• Did you know that angles are measured by how large a slice of a circle they are? If you look at the two rays that are the arms of an angle and how they come to a point where their  endpoints meet, you can almost see it as a slice of pie. The whole pie, a full circle, has 360º.   That means that we could cut the circle up into 360 equal parts, and each tiny part would be one degree. We measure angles by how many of those tiny one-degree parts fit between the two arms of the angle.

• If an angle has exactly 90º, it is called a right angle. Two perpendicular lines form the right angle, which has a perfectly square corner, like we see on a square or a rectangle. If the angle has less than 90º, it is called an acute angle. All acute angles are smaller than right angles; they could actually fit inside the arms of a right angle if you lined them up. If the angle has more than 90º, it is called an obtuse angle. All obtuse angles are bigger than right angles. A right angle could fit inside the arms of an obtuse angle if you lined it up.

• Did you know that even a straight line is an angle?   It is called a straight angle, and it measures 180º, exactly half of a circle. An angle that is so large that it bends past the straight line, but is still smaller than a full circle, is called reflex angle. It’s fun to learn about angles and think about the circles from which them come.

 Name:__________________________________

Answer the following questions based on the reading passage. Do not forget to go back to the passage whenever necessary to find or confirm   your answers.

1)   What shape helps us measure angles?

2)  What kind of angles are found inside squares and rectangles?   

3)  When you measure an angle, what does the number tell you?

4)  What is the difference between an acute angle and an obtuse angle?

5)  Describe your favorite kind of angle.  Why is it your favorite?