Yes, because a^2 + b^2 = c^2, where a and b are legs and c is the hypotenuse. Therefore, if a and b are equal, so will c.
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We're pretty sure you're looking for the two "legs", not the two "lengths". The answer is: You can't tell. There are an infinite number of different right triangles with different leg-lengths that all have hypotenuses of 4.2 . The only thing you know about the two legs is that the squares of their legs add up to 17.64, but there's no way to know both individual lengths.
No because all right triangles have 2 legs and a hypotenuse. The hypotenuse is always longer than either leg so right triangles can't be equilateral triangles.
the answer is 4
true
pythagorean theorem is a2 + b2 = c2 (only in right triangles) c is the length of the hypotenuse, and a and b are the lengths of the other two legs.