A ‘compass’ is used to draw:
Circle
Understanding the Use of a Compass in Geometry
A compass is a fundamental tool used in geometry and technical drawing. It typically consists of two arms, one with a point and the other with a pencil or pen holder, joined by a hinge. This design allows it to draw arcs and circles of varying radii.
Analysing What a Compass Draws
Let's examine the given options to determine what a compass is used to draw:
- Circle: A compass is specifically designed to draw circles. By fixing one arm (the point) at the center and rotating the other arm (with the pencil) around it, a perfectly round shape, which is a circle, is created.
- Rectangle: A rectangle is a four-sided polygon with four right angles. Drawing a rectangle requires straight lines and right angles, typically done using tools like a ruler (straightedge) and a protractor or a set square, not primarily a compass.
- Triangle: A triangle is a three-sided polygon. Drawing a triangle involves straight lines, which are drawn using a ruler. While a compass can be used in certain triangle constructions (like constructing an equilateral triangle or transferring lengths), its primary function is not drawing the straight sides of a general triangle.
- Straight line: A straight line is drawn using a ruler or a straightedge. A compass, by its nature of pivoting around a fixed point, is designed for curves (arcs and circles), not straight lines.
Based on the function and design of a compass, its primary use is to draw circles.
Conclusion on Compass Usage
The geometric tool known as a compass is used to create arcs and complete circles by maintaining a constant distance (radius) from a central point. Therefore, among the given options, the shape drawn by a compass is a circle.
The correct answer is Circle.
| Geometric Tool | Primary Shapes/Figures Drawn |
|---|---|
| Compass | Circles, Arcs |
| Ruler (Straightedge) | Straight lines, Line segments |
| Protractor | Angles, Measuring angles |
| Set Square | Right angles, Parallel lines, Specific angles (45°, 30°, 60°) |
Revision Table: Geometry Tools & Uses
| Tool | Common Use |
|---|---|
| Compass | Drawing circles and arcs with a specific radius. |
| Ruler | Drawing and measuring straight lines. |
| Protractor | Measuring and drawing angles. |
Additional Information: Exploring Compass Applications
Beyond simply drawing circles, a compass is crucial in various geometric constructions, such as:
- Constructing an equilateral triangle.
- Bisecting a line segment.
- Bisecting an angle.
- Constructing a perpendicular line to a given line from a point.
- Transferring lengths from one part of a drawing to another.
These constructions often involve drawing arcs and finding points of intersection, highlighting the fundamental role of the compass in classical geometry problems.
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