A 30-60-90 right triangle
Acute
Right Triangles
Equilateral triangles.
congruent means that all the sides are the same length. the sides of a square have to be the same length or else it would be a rectangle. Not all triangles are congruent though. there are other types of triangles unlike the square, where there is only one type.
That is one type of pyramid.
Acute
That will depend on what type of triangle it is as for example if it is an isosceles triangle then it will form two congruent right angle triangles.
Two right angle triangles, normally scalene triangles. However, if the rectangle is for example a square, then it would be two isosceles triangles.
A parallelogram can be split into two congruent triangles known as "parallelogram halves" or "diagonally opposite triangles." These triangles share a common base, which is half the length of the parallelogram's diagonal. The height of each triangle is the perpendicular distance between the base and the opposite side of the parallelogram.
Equilateral triangle
Equilateral triangles.
Right Triangles
congruent means that all the sides are the same length. the sides of a square have to be the same length or else it would be a rectangle. Not all triangles are congruent though. there are other types of triangles unlike the square, where there is only one type.
That is one type of pyramid.
90 degree triangles are always similar.
Equilateral triangles have rotational symmetry.
an equiangular triangle (and by definition, equilateral triangles are always equiangular too)