3
a circle
Here's a list of shapes that need a right angle: square rectangle right triangle
It's not that easy to answer because a straight angle is like a straight line and I think that it would be on either every or none of the shapes that I would know of. Any shape has a right, obtuse,or acute angle. So, I am guessing that no shapes have straight angles. or that a straight angle is in every angle which is not true.
rectangles
Angle
a circle
parallelogram
Here's a list of shapes that need a right angle: square rectangle right triangle
It's not that easy to answer because a straight angle is like a straight line and I think that it would be on either every or none of the shapes that I would know of. Any shape has a right, obtuse,or acute angle. So, I am guessing that no shapes have straight angles. or that a straight angle is in every angle which is not true.
rectangles
There is no standard angle for a battlefield (not battlefeild!) since they come in all shapes.
Pentagon.
Penis
Angle
There are many possible shapes with two acute angles.
There are many such shapes. A circle is perhaps the most obvious.
Well the list will go on forever but an obtuse angle is an angle bigger than 90 degrees!