A Mowhawk is the one where the sides are completely shaved off, as well as part of the back, leaving just a single, solid strip of hair from the center of the forehead to the base of the skull.
If you are referring to a shape, then a semi-circle would be the most likely shape that contains one straight side and one curved. Take a look at a protractor, it's a semi-circle.
If you're talking about length there's no way of knowing w/o knowing the angles.I expect given the lengths that you are referring to a Right Triangle and the ratio you are looking for is the standard...
We cannot know for sure, since there is not enough information. If it is a right triangle, then we can use the Pythagorean Theorem, but we don't know which side is the hypotenuse. For the sake of...