**Given: **Parallelogram ABCD is a rhombus. Side BC = 5 cm and segment AO = 3.9 cm.

1. What is the area of ABCD?

4 * (3.9cm) * (3.129cm) / 2

2 * (3.9cm) * (3.129cm)

= 24.4cm^2

2. What is the length of diagonal BD?

BD = 0B + 0D = 3.129cm + 3.129cm

=6.26cm

3. What is the measure of angle d1°?

4. What is the tangent ratio of angle c2 ?

Guest Nov 28, 2018