Q3 of 21 Page 67

Construct the quadrilaterals with the given measurements. And write steps of construction.

Parallelogram PQRS with PQ = 4.5 cm, QR = 3 cm and PQR = 60o.

GIVEN : In Parallelogram PQRS,

PQ = 4.5 cm


QR = 3 cm


PQR = 60o


PROCEDURE :


Step 1: Draw a rough sketch of the parallelogram and mark the given measurements.


Here , we are given only 3 measurements. But as PQRS is a parallelogram , we can also write that RS = PQ = 4.5 cm and SP = QR = 3 cm.


(now we got 5 measurements in total)



Step 2 : Draw ΔPQR using the measures PQ = 4.5 cm , PQR = 60°


and QR = 3 cm.



Step 3 : Locate the 4th vertex ‘S’ using the other 2 measurements PS = 3 cm and RS = 4.5 cm. To locate the fourth vertex ‘S’ , draw an arc , with center P and radius 3cm (PS=3cm).


Draw another arc with center R and radius 4.5cm (RS=4.5cm) which cuts the previous arc at S.



Step 4 : Join RS and PS to complete the required parallelogram.



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