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# Tell whether the following statements is formal or non-formal. Write F if your answer is formal and NF if it is non-formal on the space provided before each item. 1. An acute triangle is a triangle that all included angles is less than 90 degrees. 2. The diagonal of a rhombus is perpendicular to each other. 3. A number is an even number if and only if n must be squared. 4. A number n is an odd number if and only if n = 2k + 1 where k is any integer. 5. An odd number raised to a third power is always an odd number.   ### Another question on Math Math, 28.10.2019 19:28
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Mathematics 10 unit 2 module 4 lesson 1b activity 2 inscribe me
Tell whether the following statements is formal or non-formal. Write F if your answer is formal and...
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