Answer:
(3 + 4 + 5 + 7 + 10 + 12 + 15)/7 = 8
(3^2 + 4^2 + 5^2 + 7^2 + 10^2 + 12^2 + 15^2)/7 - 8^2 = 17.14285714
it is 1/6 that is the anwser
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.
