1. State whether the following angles are acute, obtuse or reflex:

(a) 56° (b) 251° (c) 132° (d) 105° (e) 57°

2. Find the value of the variables. Give an abbreviated reason selected from the following list for each answer:

  • Adj. s on st. line add up to 180°.
  • s at a pt. add to 360°.
  • Vert. opp. s equal.