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.
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.
False
It is true because a triangle with a right angle and two acute angles is a right angle triangle.
False. That is a right (-angled) triangle. An acute triangle has all three angles less than 90o
Sounds true to me, all three angles are congruent...
false
true
this is true
True
False.
false
True. It could not have 2 right angles, because the combined angles of a triangle equal 180 and 2 right angles would leave the final side at 0 degrees.
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.