Complete the angle between two lines

Exercise and reference answers

Missing parts

1. Answer

   m₁m₂

   Choices

   1. m₁m₂
   2. m₁ + m₂
   3. m₁ − m₂

2. Answer

   zero

   Choices

   1. zero
   2. one
   3. negative

Complete the statement

The acute angle θ between two lines of slopes m₁ and m₂ satisfies tan θ as a ratio whose denominator is 1 + {0}. That denominator must not be {1}.

Explanation