Construction of a 120 Degree Angle

# Construction of a 120 Degree Angle Video Lecture - Class 6

## FAQs on Construction of a 120 Degree Angle Video Lecture - Class 6

 1. How do I construct a 120 degree angle?
Ans. To construct a 120 degree angle, follow these steps: 1. Draw a line segment using a ruler. 2. Place the compass at one end of the line segment and draw an arc that intersects the line. 3. Without changing the compass width, place the compass at the intersection point and draw another arc that intersects the first arc. 4. Label the intersection point of the two arcs as point A. 5. Draw a line segment from the starting point to point A. 6. Label the angle formed as ∠BAC, which measures 120 degrees.
 2. Can I construct a 120 degree angle without using a protractor?
Ans. Yes, you can construct a 120 degree angle without using a protractor. By using a compass and a ruler, you can follow the steps mentioned in the previous answer to construct a 120 degree angle accurately.
 3. What is the measure of each angle in an equilateral triangle?
Ans. In an equilateral triangle, each angle measures 60 degrees. This is because all three sides of an equilateral triangle are equal, and the sum of all internal angles of a triangle is always 180 degrees. Therefore, each angle in an equilateral triangle is 180 degrees divided by 3, which equals 60 degrees.
 4. Can I construct a 120 degree angle using only a ruler?
Ans. No, you cannot construct a 120 degree angle using only a ruler. A ruler alone does not allow you to measure angles accurately. You would need a compass in addition to a ruler to construct a 120 degree angle accurately.
 5. How can I measure a 120 degree angle using a protractor?
Ans. To measure a 120 degree angle using a protractor, follow these steps: 1. Place the midpoint of the protractor's base on the vertex of the angle. 2. Align one of the angle's arms (rays) with the protractor's zero-degree line. 3. Read the degree measurement where the other angle arm intersects the protractor scale. 4. If the measurement reads 120 degrees, then the angle is 120 degrees. If not, adjust the position of the protractor until the correct measurement is obtained.
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