Find the length of AD.

Given :

∠ABC = 60°,
∠DBC = 45°
and BC = 40 cm.

Find lengths of diagonals AC and BD.

Given AB = 60 cm and ∠BAD = 60°.

In trapezium ABCD, as shown, AB // DC, AD = DC = BC = 20 cm and ∠A = 60°.

Find :

(i) length of AB

(ii) distance between AB and DC.

Use the information given to find the length of AB.