. a. Diagonal is 4.2 cm long.

b. The diagonal of the rectangle is 7.0 cm long.

2. Construction.

3. Construction

4.

a. A rectangle
b. A parallelogram
c. A quadrilateral

 

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Length of diagonal = 6.9 cm Length of shortest diagonal = 4.3 cm Size of missing angles are 110oand 54o. 
Length of missing side is 6.7 cm

5. Construction

6. An infinite number of quadrilatrals can be drawn with sides of 4 cm, 5 cm, 6 cm and 7 cm.