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No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.
no Not every triangle has to have one. Some triangles may be acute, meaning that none of their angles are over 90. Some triangles may be right, meaning that there is one right angle. Although some triangles may be obtuse, not all triangles are obtuse.
An obtuse triangle
All triangles have 3 sides.
The sum of the interior angles on an Obtuse Triangle is 1800 . This is true of ALL triangles.