Find the value of each expression mentally.

In an earlier lesson, you and your partner drew some angles on cards.

Put the cards together and sort the angles into 2 groups. Explain your reasoning.

1. Mai and Jada look at this drawing. Jada says it is a line. Mai says it is an angle.

   

   Do you agree with Mai or Jada? Explain your reasoning.

2. Tyler and Andre measure an angle in this letter Y.

   

   Andre said the angle he measured is obtuse. Tyler said the angle is acute.

   Explain why they could both be correct.

1. Identify each angle as acute, right, obtuse, or straight.

   

   

   

   

   

   

   

   

   

   

2. Here is a drawing of the structure of a roof.

   

   Find as many acute and obtuse angles as you can in the drawing.

   Use an “A” to label acute angles, a square (◻) for right angles, and an “O” for obtuse angles.

3. 
   

   

   1. Diego chooses a pattern block that has 2 acute angles and 2 obtuse angles. Which pattern block does Diego choose?
   2. He then chooses a pattern block with no obtuse angles. Which pattern block does he choose? Explain your reasoning.