1.   Classify the triangle by its angles.
   
    A. obtuse B. right
    C. none of these D. acute
    Hint

  2.   Classify the triangle by its angles.
   
    A. acute B. right
    C. none of these D. obtuse
    Hint

  3.   Classify the triangle by its sides.
   
    A. equilateral and scalene B. isosceles
    C. equilateral D. scalene
    Hint

  4.   Classify the triangle by its sides.
   
    A. scalene B. isosceles
    C. equilateral D. equilateral and scalene
    Hint

  5.   Classify the triangle by its sides.
   
    A. scalene B. isosceles and equilateral
    C. equilateral D. isosceles
    Hint