(i)
As AD || BC,
∴ ∠A + ∠B = 180° (Adjacent angles are supplementary)
⇒ 74° + ∠B = 180°
⇒ ∠B = 180° − 74° = 106°
Now, ∠A = ∠C = 74° (opposite angles of Rhombus are equal)
[1 mark]
(ii)
We know that sides of a rhombus are equal.
∴ BC = CD = AD = 7.5 cm
[1 mark]