Draw a rhombus, having each side of length 3.5 cm and one of the angles as 40°.

1. Draw a line segment AB of 3.5 cm.

2. Draw $\angle B A X$ equal to $40^{\circ}$.

3. With A as centre and the radius equal to AB, cut AD at 3.5 cm.

4. With D as centre, cut an arc of radius 3.5 cm.

5. With B as centre, cut an arc of radius 3.5 cm. This arc cuts the arc of step 4 at C.

6. Join DC and BC.