A triangle.
The effect of turning will depend on whether the plane containing the triangle is rotated - that is, the triangle is rotated around an axis perpendicular to its plane. In that case, it will appear upside down.
Alternatively, it can be rotated about an axis in the plane of the triangle. In this case it will appear flipped.
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Yes
It will be an obtuse or an isosceles triangle which would look like a straight line
It will have interior angles of 45, 45 and 90 degrees.
All 3 interior angles are less than 90 degrees.
if you know what a acute triangle looks like and you know what a isosceles triangle looks like just combined them together and then find the angles and degrees you'll find what a acute isosceles triangle looks like if you got the degrees right and angles