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RPinPA said:Is your last line in Greek the same meaning as the traditional Latin closing "quod erat demonstrandum" (QED)?
An isosceles triangle is a triangle with two sides of equal length.
No, not all triangles are isosceles. Only triangles with two equal sides are considered isosceles.
You cannot prove that all triangles are isosceles because it is a false statement. All triangles cannot be isosceles because there are different types of triangles, such as equilateral and scalene, that do not have two equal sides.
An isosceles triangle has two equal sides, while an equilateral triangle has three equal sides.
Yes, an isosceles triangle can have angles of different measures. However, the two equal sides will always be opposite the two equal angles.