This instrument is used to draw circles, arcs, radii, and parts of many symbols.
A. Compass
B. Divider
C. Protractor
D. Tape ruler
The correct answer and explanation is :
Correct Answer: A. Compass
Explanation (300 words):
A compass is a precision drawing tool primarily used in mathematics, drafting, and geometry. It consists of two arms connected by a hinge. One arm has a pointed end (usually a metal spike) that anchors the tool in place on the drawing surface, and the other arm holds a pencil or pen that draws as the compass rotates.
The main function of a compass is to draw circles and arcs with a consistent radius. By adjusting the distance between the two arms, the user can set the desired radius. When the compass rotates around the anchor point, the pencil traces a perfect circle or arc. This makes it an essential tool in geometry for constructing shapes, solving problems involving radius and diameter, and illustrating theorems.
Beyond circles and arcs, a compass is also useful in creating radii—straight lines from the center of a circle to any point on its circumference. Furthermore, many geometric symbols such as angles, sectors, and technical diagram symbols include circular or curved elements, which can be neatly drawn with a compass.
Let’s briefly compare the other options:
- B. Divider: A divider looks similar to a compass but has two pointed arms instead of one pointed and one pencil-holding arm. It’s mainly used to measure distances on maps or transfer measurements.
- C. Protractor: A semicircular or circular tool used to measure and draw angles, not circles or arcs.
- D. Tape ruler: A flexible measuring tool used to measure straight lengths, commonly used in tailoring or construction.
Thus, the compass is the correct instrument for tasks involving circles, arcs, radii, and elements of various symbols. It remains a fundamental tool in mathematics, engineering, architecture, and design.