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Thought-Process to Discover Knowledge

Welcome to nubtrek.

Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

Read in the blogs more about the unique learning experience at nubtrek.

•  compass

•  protractor

•  divider

•  set-squares or set-triangles

click on the content to continue..

What is the geometrical instrument in the figure called?

• ruler
• ruler
• compass
• divider
• protractor

What is a "ruler" used for?

• to construct an arc
• to construct a straight line
• to construct a straight line

The answer is "to construct a straight line"

What are the marks on the ruler?

• the length measure, millimeter and centimeter, is marked
• the length measure, millimeter and centimeter, is marked
• no markings are found in a ruler

The answer is "the length measure is marked"

Other than to construct straight lines, what is a "ruler" used for?

• to measure an angle
• to measure a line-segment
• to measure a line-segment

The answer is "to measure a line-segment"

Which of the following is a meaning for the word "ruler"?

• a straight stick
• a straight stick
• a book of rules

The answer is "a straight stick". The word "ruler" is derived from a root word meaning straight stick.

What is the term used to refer "a straight stick"?

• Pronunciation : Say the answer once

Which of the following is a meaning for the phrase "graduated ruler"?

• a straight stick with grade of length measure marked on it
• a straight stick with grade of length measure marked on it
• a book of rules for graduates

The answer is "a straight stick with grade of length measure marked on them".

Note: A ruler is also referred with the name "scale".

Graduated Ruler or scale : A ruler is a straight stick with grade of length measure marked. It is used to construct straight lines and measure a line-segment.

What is the geometrical instrument in the figure called?

• compass
• compass
• protractor

What is a "compass" used for?

• to construct an arc of given radius
• to construct an arc of given radius
• to construct an angle of given measure

The answer is "to construct an arc of given radius". The arc has points that are in equal distance from the center point.

The word "compass" is (possibly) from root words "com+pace" meaning "together+take-steps".

What is the term used to refer "the instrument to mark an arc"?

• Pronunciation : Say the answer once

Compass : An instrument to measure a length and construct an arc of a given radius.

What is the geometrical instrument in the figure called?

• compass
• divider
• divider

What is a "divider" used for?

• to measure the length between two points
• to measure the length between two points
• to mark an angle

The answer is "to measure the length between two points"

What is the term used to refer "the instrument used to measure length between points"?

• Pronunciation : Say the answer once

Divider : is a geometrical instrument which is used to measure the length between two points.

What is the geometrical instrument in the figure called?

• squares
• protractor
• protractor

What is "protractor" used for?

• to mark length of a line segment
• to mark an angle of given measure
• to mark an angle of given measure

The answer is "to mark an angle of given measure"

The word "Protractor" is from root words "protract+tor", which means "draw-out or lengthen a line".

What is the term used to refer "instrument to mark an angle of given measure"?

• Pronunciation : Say the answer once

Protractor : is a geometrical instrument which is used to mark a measure of an angle.

What is the geometrical instrument in the figure called?

• set squares
• set triangles
• either one of the above
• either one of the above

The answer is "either one of the above". The name "set squares" calls by the two 90^@ angles provided by the instruments. The name "set triangles" calls by the shape of the two pieces. Both names are used.

What is "set squares" used for?

• to construct perpendicular and parallel lines
• to measure standard angles 90^@, 30^@, 45^@, 60^@ etc.
• both the above
• both the above

The answer is "both the above"

What is the term used to refer "set of triangles with standard angles "?

• Pronunciation : Say the answer once
Set Squares or Set Triangles : is a pair of triangular pieces used to construct parallel lines or to measure the standard angles 90^@, 30^@, 45^@, 60^@ etc.