Cosine Rule: a2 = b2+c2-2bc*cos A is applicable to all triangles
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Only right triangles.
NO!!!! Only to right angles (90 o) triangles. For other types of triangle, you have to use a construction line, which has a right angle in it.
If it is in the form of two inverted triangles, then there are 8 triangles. If only the outline is used, there are 0 triangles.
No, two equilateral triangles do not make a square. A square has four equal sides and four right angles, while an equilateral triangle has three equal sides but three angles that add up to 180 degrees. When two equilateral triangles are put together, they do not form a shape with four equal sides and four right angles, which is the defining characteristic of a square.
Only if they have the same angles