Mathematics
Answer
Steps of construction :
Draw a line segment AB = 6.3 cm.
Draw BP, such that ∠ABP = 90°.
With B as center and radius equal to 4.2 cm draw an arc cutting BP at C. Join BC.
With C as center, draw a line CD, such that ∠BCD = 90°.
Join AD.

Hence, ABCD is the required quadrilateral.
Construct a parallelogram ABCD, when :