In a rectangle ABCD, AB = 20 CM , angleBAC= 60° calculate the side DC and diagonal AC and BD

In a rectangle ABCD, AB = 20 CM , angleBAC= 60° calculate the side DC

1.	In a rectangle ABCD, AB = 20 CM , angleBAC= 60° calculate the side DC and diagonal AC and BD
Answer» DC = AB = 20 cm (given); AC = BD = 40 cm(given) cos60° = B/H => 1/2 = 20/H => H=40 cm. Apply trigonometry?