The corner of an infant’s bassinet is shown. Determine angles a and ß and dimensions a and b of.

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The corner of an infant's bassinet is shown. Determine angles α and β and dimensions a and b of the side and end pieces so the corners of the bassinetwill properly meet when assembled. Answer: α=4.70 deg, β=9.43 deg, a=12.2in., b=12.0in.I don't understand how to set this problem up and Idon't understand how a and b can be two diffrent lengths??