Question

in a rectangle abcd ab = 20cm angle bac = 60 degree then find the length if the side ad

Answer 1

if the angles are in the ratio 1:2:3 the angles are in the ratio 1:2:√3
as AC and DB are parallel ∠BAC=∠ACD=60 AS ∠BCA:∠CAB:∠ABC is in the ratio 1:2:√3 ad=40