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No, it is not true.

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False

Q: Is it true that an isosceles triangle may be right or acute but never obtuse?

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No triangle is never acute in the sense that every triangle has at least two acute angles.

No not never can a triangle have 3 obtuse angles but it can have 3 acute angles

No, it is not true.

Not true. A triangle with angles of 90, 45 and 45 is a right angled isosceles triangle. If you take a square piece of paper and fold it in half - from corner to corner - you will get this shape.

No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.

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False

No triangle is never acute in the sense that every triangle has at least two acute angles.

right triangle

false

Not true. A triangle with angles of 90, 45 and 45 is a right angled isosceles triangle. If you take a square piece of paper and fold it in half - from corner to corner - you will get this shape.

No, it is not true.

No not never can a triangle have 3 obtuse angles but it can have 3 acute angles

No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.

Sometimes an isosceles triangle but never a scalene triangle with 3 interior acute angles.

A right triangle may be isosceles or scalene (though not at the same time), but never acute, since an acute triangle is defined as having all interior angles less than 90°. A right triangle by definition has one 90° angle.

Congruent means "equals" or "the same." Basically if you take a shape and flip it over or mirror it, or do anything else that copies the original in size and shape, it is congruent to the original. An obtuse triangle has one angle greater than 90* and an acute triangle has three angles that are less than 90*. No matter how you turn or flip or mirror those triangles, acute will never be obtuse and obtuse will never be acute. But if you take an acute triangle, and flip it upside down, it is still acute, and still has the same proportions, and therefore is congruent to the original.

A triangle can never include a right angle and an obtuse angle together in it.