Lesson 5

Are You Ready?

 

You are probably a good judge of length and distance, but how are you at estimating angles? Estimation skills are an important aspect of problem solving. You can use your estimation skills to evaluate whether or not an answer you determined is reasonable.

1. Angle referents are simple tools found in everyday items that help you to estimate angle measures.
   
   Take the square corner of a scrap piece of paper and fold the right angle in half. Then fold it in half again so that the three creases divide the right angle into quarters, as shown in the diagram. How large is each angle? Write the measures of these angles on the creases. These angles will serve as referents in judging angle size in question 2.
   
   
    
   
   
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2. Use the angles from question 1 as referents to estimate each angle.
   
   
    
   
   
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