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Q.
Name the geometrical instrument having a semi-circular device graduated into 180 degree-parts.
  • a)
    Divider
  • b)
    Compasses
  • c)
    Set squares
  • d)
    Protractor
Correct answer is option 'D'. Can you explain this answer?
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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
A semi-circular device grduated into 180 degree-parts. The measure starts from 0° on the right hand side and ends with 180° on the left hand side and vice-versa.
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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
Answer:

The geometrical instrument having a semi-circular device graduated into 180 degree-parts is called a protractor.

Explanation:

A protractor is a tool used in geometry to measure and draw angles. It is typically made of transparent plastic or metal and has a semi-circular shape. The semi-circle is divided into 180 equal parts or degrees, starting from 0° at one end to 180° at the other end. The protractor also has a center point called the vertex and a base line that helps align it with the angle being measured.

Functions of a protractor:

1. Measuring angles: The graduated scale on a protractor allows us to measure the size of an angle accurately. To measure an angle, we place the protractor's center on the vertex of the angle and line up the baseline with one of the angle's arms. Then we can read the measurement from the scale where the other arm intersects.

2. Drawing angles: With the help of a protractor, we can also draw angles of specific sizes. We start by placing the center of the protractor on the point where we want the vertex of the angle to be. Then we align the baseline of the protractor with a reference line and mark the desired angle measurement on the scale. Finally, we draw the arms of the angle using a ruler or straight edge.

3. Constructing geometric figures: A protractor is an essential tool for constructing geometric figures accurately. By using the measurements obtained from a protractor, we can create angles, triangles, quadrilaterals, and other shapes with precise angles.

In conclusion, a protractor is a geometrical instrument that plays a crucial role in measuring and drawing angles. It is an indispensable tool for students studying practical geometry in mathematics.
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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
Protractor
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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are available for Practice, which would help you prepare for chapter Practical Geometry, Class 6, Mathematics . You can practice these practice quizzes as per your speed and improvise the topic.Q.Name the geometrical instrument having a semi-circular device graduated into 180 degree-parts.a)Dividerb)Compassesc)Set squaresd)ProtractorCorrect answer is option 'D'. Can you explain this answer?
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