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)
2. What is the length of diagonal BD?
BD = 0B + 0D = 3.129cm + 3.129cm
3. What is the measure of angle d1°?
4. What is the tangent ratio of angle c2 ?