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Q: What does a triangle must have?

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It must be acute angled.

There is no such triangle. A triangle must have exactly 3 sides.

A triangle must have straight lines.

A right triangle.

No, but an equilateral triangle must be acute.

No, they must be either one or the other.

In the middle of the triangle

Yes such as an isosceles triangle

That it must be a right angle triangle because the 3rd angle must be 90 degrees

...a right triangle.

it must be a right triangle.

A right triangle.

In Euclidean plane geometry every triangle MUST BE coplanar.

Since the triangle has a hypotenuse, it must be a right triangle. Therefore, the Pythagorean theorem applies, and the height of the triangle must be sq rt (32 - 22).

no; a triangle must have an obtuse angle if one of its altitudes is outside of the triangle, and in this case 2 of the altitudes are out of the triangle.

It is impossible to have an obtuse AND scalene triangle, because in order for it to be obtuse, it must have one obtuse angle but, in order for a triangle to be scalene it must have two equivalent sides. So, in the end if you have an obtuse and scalene triangle, it is not longer a triangle.

NO

No, an acute triangle must have all 3 angles under 90 degrees. A triangle can have an acute angle and still be a right triangle or an obtuse triangle.

I do not know about angels but a triangle must have exactly three angles.

2 sides

No.

That is correct

The orthocenter of a triangle is found at the intersection of the three altitudes of the triangle. Obtuse triangles contain altitudes which are found outside of the triangle, meaning their orthocenter must be outside of the triangle as well.

Since a triangle with two equal angles must have two equal sides, it is an isosceles triangle.

The third angle must be 90 degrees so it's a right-angled triangle