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ff The number of points of intersection of two perpendicular lines is ff
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ff Write the first step of an indirect proof of the following statement: ∠ A is not a right angle. ff
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ff Which of the following statements can be used to say: ∠ AOC + ∠ COB = ∠ AOB ? ff
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ff Write the first step of an indirect proof of the following statement: AB ↔ and CD ↔ are perpendicular lines. ff
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ff What conclusion follows from the following pair of statements? 1. If two non vertical lines are perpendicular, then the product of their slopes is - 1. 2. The product of the slopes of non vertical lines l and n is not - 1. ff
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ff Which of the following is the reason for the statement: ∠ 1 is congruent to ∠ 2? ff
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ff It is given that m ∠ A = m ∠ B . Which of the following is the reason for the statement: ∠ A ≅ ∠ B? ff
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ff It is given that m ∠ A = 90 and m ∠ B = 90 . Which of the following is the reason for the statement: m ∠ A = m ∠ B ? ff
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ff ∠ 1 and ∠ 2 are complementary angles. Which of the following statements can be used to say: ∠ 1 + ∠ 2 = 90^{o} ? ff
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