You would use the Pythagorean threroem 4^2 + 5^2 = C^2. 16 + 25 = 41 the square root of 41 is 6.40
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Answer:
3 x 21
20 x 4 tenths
21 x thirteenth
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6 and 10 because 6 times 10 is 60 and 6 plus 6 plus 20 plus 10 is 32