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Question

# Which of the following tools are not sufficient to draw perpendicular lines? [Assume that you have a well sharpened pencil!]

A

Ruler

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B

Compass and Ruler

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C

Protractor and Ruler

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D

Set square

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Solution

## The correct option is A Ruler With the help of a ruler, we can draw roughly perpendicular lines, but we can’t be sure that the lines will be exactly perpendicular. We get lines that are perfectly perpendicular with the help of a set square. Placing the protractor on a line drawn using a ruler, we can mark 90 degrees and on joining that point with the vertex of the angle, we get a perpendicular line. With the help of a compass, we can construct the perpendicular bisector to a line segment or construct a 90 degrees angle. Either way, we get a perpendicular line.

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