No, never.
Never
The hypotenuse is NEVER opposite an acute angle. It's always the side of the right triangle that's opposite the right angle.
No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.
No triangle is never acute in the sense that every triangle has at least two acute angles.
acute equalateral
No, never.
Never
never
The hypotenuse is NEVER opposite an acute angle. It's always the side of the right triangle that's opposite the right angle.
No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.
No triangle is never acute in the sense that every triangle has at least two 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.
right triangle
The interior angle of a polygon and its adjacent exterior angle can never be complementary.
A triangle can never include a right angle and an obtuse angle together in it.
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.