project on collect real life examples for different pairs of angles and draw the figures
Answers
Step-by-step explanation:
Did you ever notice the two hands of a clock? The two hands together make different sets of lines from a common point. These sets of lines from a common point is called angle. The two hands form different angles every minute of the time. A clock forms an example of angles in real life. What are the other examples of angles in real life? Let’s study the various types of angles, say acute angle, in real life and their examples in detail.
Angles
Before studying angle, let us do one interesting thing. Take a piece of paper and drawn a dot anywhere on it. Name this dot O. This dot O is called point. From this point draw as many straight lines as you can. How many did you get?
Draw another dot and name it P. Join OP. What did you get? A line segment OP with endpoints O and P. A line segment is a part of a line. Do you know a line has no endpoints like line segment? A line has many line segments in it.
Have you ever thought why we say sun rays and not sun line? Is ray different from a line? Yes, it is. A ray has one fixed point. It cannot go in both the direction like that a line. For sun rays, the Sun is the fixed point and thus we say the light coming as sun rays.
Draw one more point other than O and P and call it R. Now join OR and OP. What will you find? Two lines and a common point O. This is an angle. Ask your friend to do this activity. Are the two angles same every time? Maybe it is not.
Terminologies in Angles
Two lines or line segments or rays with a common point form an angle. An angle is denoted by a symbol ∠. An angle is measured in an anti-clockwise manner with the help of a protector in degree.
Vertex: The common starting point in an angle is a vertex.
Arms: The two rays forming an angle from a fixed point are arms. They are also called the sides of the angle.
Angles in Real Life
Measuring Angle: Place the center of the protector at the fixed point, say O of the angle at one of the arm. The other arm shows the degree of the angle when measured from the initial arm in an anti-clockwise manner.