Given 
of length 3.9 cm, construct 
such that the length of 
is twice that of 
. Verify by measurement.
Steps of Construction-
1. Draw a line segment AB of length 3.9 cm using a ruler.
2. Take a measure of it on compass and draw a point X.
3. Draw arcs on both sides of it and join them named as P and Q.
4. Measure PQ. PQ = 7.8 cm
4