What types of triangles can have an obtuse angle? scalene right acute isosceles

Scalene = yes it is possible (example: 105 degrees, 5 degrees, 70 degrees)

Right = No, the reason why is because the remaining angles must add to 90 which is less than a right angle. So it's impossible to have one angle over 90 degrees. 

Acute = Also no. All three angles are less than 90 degrees

Isosceles = Yes. It is possible. One example would be 120 degrees, 30 degrees, 30 degrees.

9/12 is the answer because 3/4 times 3 each is 9/12

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