Question

find the total number of rectangle on the normal chessboard
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Answer 1

56

The number of ways to select R x C rectangle out of a chess board will be (9-R)*(9-C). Rectangles with one row many columns: 1 x 1 rectangles = (9–1)*(9–1) = 64. 1 x 2 rectangles = (9–1)*(9–2) = 56

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Answer 2

Answer:

The number of ways to select R x C rectangle out of a chess board will be (9-R)*(9-C). Rectangles with one row many columns: 1 x 1 rectangles = (9–1)*(9–1) = 64. 1 x 2 rectangles = (9–1)*(9–2) = 56.