A regular nonagon has 9 obtuse angles of 140 degrees
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It can have angles which are acute, right, obtuse or reflex. Not straight angles, though.
No, an obtuse triangles has one obtuse angle and two acute angles. If a triangle has an obtuse angle, it is considered obtuse and cannot be acute.
An acute triangle has three interior acute angles An obtuse triangle has one obtuse and two acute interior angles
acute
yes an obtuse triangle has two acute angles