You want to measure the border of a book for a custom protective cover. The book is 35 cm long and 20 cm wide. What is the perimeter of the book?

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A 110 cm
B 45 cm
C 85 cm
D 57 cm

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Answer: A. 110 cm

Perimeter of a rectangle = 2 x (length + breadth) = 2 x (35 + 20) = 2 x 55 = 110 cm. Adding only one length and one width gives 55, which is just half the border.

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You want to measure the border of a book for a custom protective cover. The book is 35 cm long and 20 cm wide. What is the perimeter of the book?

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