There are several possible answers:
A triangle (or other polygon) on a spherical surface.
A plane regular polygon with 5 or more sides.
A shape comprising an obtuse angle and an arc, for example a slice of a Pizza that is more than a quarter.
No, not if it is a randomly-drawn 8-vertex shape. Octagons only have all- obtuse angles if it is a regular octagon, like the shape of a stop sign.
There are versions of quadrilaterals, pentagons and hexagons that have only two obtuse angles. If a shape with seven or more sides has two (or fewer) obtuse angles, it will also have at least one reflex angle and so will no longer be a convex polygon.
Hexagon
Yes the interior angles of a regular octagon are obtuse.
I only know it's not a polygon
"z" has two acute angles a triangle can have 3 acute angles but also will have a angle >= 60degrees acute (also note for every acute angle a obtuse angle is formed the sum of the obtuse and acute angle will = 360) because of this a arrow is the only shape with two acute angles and 1 obtuse
2 obtuse and 2 acute in the classic kite shape.
It depends on they type of arrowhead you have. If it is a arrowhead in the shape of a directional arrow, there are no obtuse angles. The most possible obtuse angles is 1.
There is no three-sided shape with two obtuse angles, because the three interior angles of a three-sided shape, which is a triangle, add up to 180 degrees, and two obtuse angles would be over 180 degrees.
A quadrilateral is any shape with four sides; angles can be acute or obtuse. A perfect square is the only quadrilateral with only right angles.
a pentagon
A hexagon or pentagon will have obtuse angles (greater than 90 degrees). A triangle has angles that are all less than 90 and a square has only 90.