Construction of Quadrilateral Polygon

Welcome to class!

In today’s class, we will be talking about the construction of the quadrilateral polygon. Enjoy the class!

A construction in mathematics is an accurate drawing done usually using only instruments such as a ruler as a straight edge and a pair of compasses.

When drawing a construction, leave all of your construction arcs and lines.

Construction of Quadrilaterals

Quadrilaterals are four-sided polygons. Types of quadrilaterals include squares, rectangles and parallelograms.

To be able to construct quadrilaterals, certain information is needed about the sizes of the angles and sides of the shape.

The instruments used for constructions, which include ruler, compasses and protractors are described.

Some of the types of constructions of quadrilaterals are described below:

Construct a rectangle with sides of 5 cm and 6 cm.
Step 1: Measure a 5 cm line AB with a ruler. Step 2: Make a right angle at A. Step 3: Draw an arc, centre A, length 6 cm, mark point C. Step 4: Make the right angle at B. Step 5: Draw an arc, centre B, length 6 cm, mark point D. Step 6: Join C and D
Construct a parallelogram PQRS with a base PQ of 6 cm an angle of 60o and the other side of 4 cm.
Step 1: Measure the base side, PQ, 6 cm long, with a ruler.
Step 2: Make an angle of 60o at P.
Step 3: Draw an arc, centre P, radius 4 cm, mark point S.
Step 4: Draw an arc, centre S, radius 6 cm. Draw an arc, centre Q, radius 4 cm.
Step 5: Where the arcs intersect is point R. Join PQRS.