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DE = EA + AD = (8 + 5)cm =13 cm DE is the radius of the circle. Also, DB is the radius of the circle. Next, AC = DB [Since diagonals of a rectangle are equal in length] Therefore, AC = 13 cm. From ∆ADC, DC2 = AC2 – AD2 = 132 – 52 = 169 – 25 = 144 = 122 So, DC = 12 Thus, length of DC is 12 cm. Hence, perimeter of the rectangle ABCD = 2 (12 + 5)cm = 34 cmRead more on Sarthaks.com - https://www.sarthaks.com/840635/rectangle-abcd-is-formed-in-circle-shown-fig-cm-and-ad-cm-find-the-perimeter-of-the-rectangle
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