Answers

2015-12-12T23:46:06+08:00
Right and Left , Obtuse , Acute , Straight, Reflex, Vertical ,Complementary.
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2015-12-13T11:10:04+08:00
We have the:
Right ∠ - exactly 90° 
Straight ∠ - exactly 180°
Acute ∠ - are ∠ having a degree of measurement less than 90°
Obtuse ∠ - are ∠ having a degree of measurement greater than 90° but less than 180°
Reflex ∠ - are ∠ having a degree of measurement greater than 180° but less than 360°
We have a complete revolution (actually I forgot it's name so...) which have exactly 360°
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