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.
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Triangles do not have to have any obtuse angles but they can have one.
yes, there can be an obtuse internal angle in a triangle, but keep in mind that the other two angles' sums plus the obtuse angle can only equal 180 degrees (meaning that the other non-obtuse angles will be very small acute angles)
Some have one obtuse interior angle, others have none. A triangle can have no more than one obtuse angle.
A rhombus have 2 obtuse angles
name two obtuse vertical angles.