False
------------------------------------
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
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.
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.