All triangles have 3 sides and 3 interior angles that add up to 180 degrees and are classed as follows-
1 Scalene triangle has 3 different acute angles
2 Right angle triangle has a 90 degree angle and 2 acute angles
3 Obtuse triangle has 1 obtuse angle and 2 different acute angles
4 Isosceles triangle has 2 equal acute angles and 1 other angle
5 Equilateral triangle has 3 equal 60 degree angles
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A triangle forms other polygons as for instance there are 4 triangles in an hexagon and 8 triangles in a decagon
No, not all isoceles triangles can be equilateral triangles because an equilateral triangle has sides that are all equal to each other and an isoceles triangle has only two sides that are equal to each other.
Yes a regular triangle will tessellate as will all other types of triangles.
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In geometry when comparing two triangles, if all three angles of each triangle are congruent to corresponding angles in the other triangle, then both triangles are similar.