COMPASS DRAWING
Definition Of Compass Drawing
Compass is a tool used for drawing circles, arcs or other geometrical constructions.
More About Compass Drawing
There are two arms in a compass. One arm is sharp and other arm can hold a pencil for construction.
Video Examples:How to draw angles 30 45 60 90 degrees with Compass
Example of Compass Drawing
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The above figure is a compass and is used to draw circles of different radii.
Solved Example on Compass Drawing
Ques: Identify the correct statement for the construction.
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Choices:
A. Use a compass to bisect all three angles in a triangle. Use the point of intersection of the bisectors as the center of a circle that circumscribes the triangle.
B. Use a compass to bisect all three angles in a triangle. Use the point of intersection of the bisectors as the center of a circle that is inscribed in the triangle.
C. Use a compass to draw the perpendicular bisectors of the three sides in a triangle. Use the point of intersection of these bisectors as the center of a circle that circumscribes the triangle.
D. Use a compass to draw the perpendicular bisectors of the three sides in a triangle. Use the point of intersection of these bisectors as the center of a circle that is inscribed in the triangle.
Correct Answer: B
Solution:
Step 1: The correct statement: Use a compass to bisect all three angles in a triangle. Use the point of intersection of the bisectors as the center of a circle that is inscribed in the triangle.
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Quick Summary
- A compass is used to draw circles and arcs.
- Compass drawings are used to construct geometric figures accurately.
- Common constructions include bisecting angles, drawing perpendicular lines, and creating regular polygons.
🍎 Teacher Insights
Encourage students to practice each construction multiple times to develop muscle memory. Emphasize the importance of accuracy and precision. Relate compass drawings to real-world applications, such as architectural design and mapmaking.🎓 Prerequisites
- Basic understanding of geometric shapes (circles, triangles)
- Knowledge of angle and line bisectors
- Familiarity with using a ruler
Check Your Knowledge
Q1: Which of the following is NOT typically constructed using a compass?
Q2: What is the primary purpose of using a compass in geometric constructions?
Frequently Asked Questions
Q: What is the difference between a compass and a protractor?
A: A compass is used to draw circles and arcs, while a protractor is used to measure angles.
Q: Why is a straightedge used instead of a ruler with markings?
A: A straightedge is used for purely geometric constructions, avoiding reliance on numerical measurements.