in a childrens book it is found in the middle of the book but with adults it is not normally there.
Given the reference perspective of a specific angle the sides are are the adjacent sides and the opposite side If we have a right triangle the longest side (opposite the right angle) is the hypotenuse.
The hypotenuse
The hypotenuse is the longest side in a right triangle and it is opposite the right angle. It is always opposite the right angle and is found by using the Pythagorean theorem.
Opposite side of the right angle which is the hypotenuse
If you mean cosine then it is angle ratio found in a right angle triangle which is adjacent/hypotenuse
it is all about Perspectives. perspective is all that matters.
corner, perspective
a right angle is a right angle
Because a right angle is a right angle.
A right angle is an angle of 90 degrees.
cosine
Assuming your question is what makes a right-angle, it is an angle of 90o .