Make an equilateral triangle(all same sides) with 3 lines and put the 4th on right through the middle and you have 2 right angle triangles.
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Think about 3-D shapes.Eight equilateral triangles would form two square based pyramids stuck together.Count all the lines of the shape.It will have twelve lines which would be enough lines for twelve matchsticks.
Well a parallelogram is a 4 sided shape with 2 pairs of parallel lines, hence PARALLELogram. That's the reason, because there are two pairs of parallel lines.
two acute angles and three lines
You determine the similarity of two triangles through the equality of each two relevant lines and the equality of each relevant two interior angels.
No, scalene triangles, which have sides of different lengths, have none. Isosceles triangles, with only two sides the same, only have one.