In a rectangle ABCD, AB=20cm, ∠BAC=60∘, Then side BC=

1.	In a rectangle ABCD, AB=20cm, ∠BAC=60∘, Then side BC=
Answer» In a rectangle $A B C D$ , $A B = 20 c m$ , $∠ B A C = 60^{\circ}$ , Then side $B C =$

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