An acute angled triangle means all the angles are less than 90 degrees because an acute angle is an angle less than 90 degrees.
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Not necessarily. But a regular triangle must be acute angled.
An acute-angled triangle is a triangle in which all the interior angles are between 1 and 89 degrees.
An acute angled triangle, right angled triangle or obtuse angled triangle.
An acute angled triangle.
a scalene can be a right-angled triangle or a obtuse angled triangle or a acute angled triangle depending on the angles of the triangle.