Question

A rhombus of side 20cm has two angles of 60° each. find the length of the diagonals.

Answer 1

d= √2 a , 20√2 will be the

Answer 2

hello,
for this question we will use trignometry
inΔAOD
sin30°=AO/AD
1/2=AO/20
AO=10cm
∴diagonal AC=2AO=20cm
now
cos30°=OD/AD
√3/2=OD/20
OD=10√3cm
∴diagonal BD=2OD=20√3cm
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