The triangle in this question is not drawn accurately. Use Pythagoras' Theorem to explain why triangle A must be right-angled.

Answer:
We know the triangle in a right triangle because of the pythagoras theorem: 5^2+12^2=13^2
25 + 144 equals 169, making it a right triangle since the equation works.
Step-by-step explanation:
I tried to explain this the best i could, hope it works :)
The triangle should be the right triangle since the square of the hypotenuse side is equivalent to the sum of squares of the other two sides.
Under this theorem, the square of the hypotenuse side is equivalent to the sum of squares of the other two sides.
So it be like
[tex]13 = \sqrt{(5)^2 + (12^2)}\\\\ 13 = \sqrt{25 + 144}\\\\ 13 = \sqrt{169} \\[/tex]
13 = 13
Hence, it is proved.
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