False
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An acute triangle is one in which all angles are acute angles.
An acute angle is less than 90°.
A right angle is 90°, which is equal to 90° not less than 90°
Therefore all the angles of a right triangle are not all acute
Thus a right triangle is not an acute triangle.
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False
true
True
False.
In Euclidean geometry, a triangle must be one of these: acute, obtuse, or right. Maybe there is a non-Euclideangeometry for which some obtuse triangles can contain a right angle, but it doesn't happen in Euclidean geometry.