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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.
"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
A trapezoid has 4 sides, 2 acute and 2 obtuse angles, and only one pair of parallel sides
you cannot make a regular shape which has 3 right angles only, you will always end up with 4 right angles
It is a trapezoid and its other 2 angles are obtuse and acute