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Show that in a right angled triangle, the hypotenuse is the longest side.
To do:
We have to show that in a right-angled triangle, the hypotenuse is the longest side.
Solution:
Let us consider $ABC$ a right-angled triangle
We know that the sum of the interior angles of the triangle is always $180^o$.
This implies,
$\angle A+\angle B+\angle C=180^o$
$90^o+\angle B+\angle C=180^o$
$\angle B+\angle C=180^o-90^o$
$\angle B+\angle C=90^o$
Now, we have
$\angle B+\angle C=\angle A=90^o$
From this, it is clear that $\angle A$ is the largest angle.
We know that the side opposite the largest angle is the longest side.
This implies,
$AB$ is the longest side.
Therefore,
$AB$ is the hypotenuse of the $\triangle ABC$ and is the longest side of $\triangle ABC$.
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