Hi!
A hypotenuse is the longest leg in a right triangle.
A right triangle is a triangle that has one 90 degree angle.
The hypotenuse is always directly across from the right angle.
In pictures, right angles are represented by a square.
Therefore, the side with the hypotenuse is side 3, because we can see that the angle between side 1 and side 2 is the right angle, and the hypotenuse would be directly across.
For more information, see:
https://brainly.com/question/21440624
For information about parts of a right triangle, see:
https://brainly.com/question/22137749
Image = other parts of a right triangle:
