Maths formulas for class 9 chapter- Constructions Formula

May 18, 2022, 16:45 IST

Class 9 chapter- Constructions Formula

Constructions

For drawing geometrical figures such as a triangle, a circle, a quadrilateral, a polygon, etc. with given measurements some basic geometrical instruments are needed.
A graduated scale, on one side of which centimeters and millimeters are marked off and on the other side inches and marked off.
A pair of set-squares, one with angles 90°, 60° and 30° and other with angles 90°, 45° and 45°.
A divider
A compass with provision of fitting a pencils at one end.
A protractor

But a geometrical construction is the process of drawing a geometrical figure using only two instruments-an un graduated ruler and a compass. In construction where measurements are also required, one may use a graduated scale and protractor also.

Basic Constructions

To construct the bisector of a given angle.
To construct the perpendicular bisector of a given line segment.
To construct and angle of 30°, 45°, 60°, 90°, 120° at the initial point of a given ray.

Construction of Triangles

To construct a triangle given its base, a base angle and sum of the other two sides.
To construct a triangle given its base, a base angle and the difference of the other two sides.
To construct a triangle, given its perimeter and its two base angles.

NCERT Solutions are very helpful to score good marks in Class 9 Maths do solve questions from text book with the help of NCERT Solutions for class 9 Maths prepared by academic team of Physics Wallah. Download the pdf of maths formulas for class 9 chapter- Constructions from Physics Wallah.

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