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set 4 - #10
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prachipareekh
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ABCD is a rhombus.
=>AB=AC=AD => are all radii.
=>ABC is an equilateral triangle.
Thus 2x = angle A = 60
=> x = 30
Hence B
=>AB=AC=AD => are all radii.
=>ABC is an equilateral triangle.
Thus 2x = angle A = 60
=> x = 30
Hence B
