If you're talking about adjective, like in parts of speech, then the word 'right' is the adjective, describing the noun 'triangle'.
if the triangle has one right angle in it
If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.
It is the longest side of a right angle triangle.
If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.
By using Pythagoras' theorem for a right angle triangle.
if the triangle has one right angle in it
If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.
If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.
The adjective form of triangle is triangular.
It has a 90 degree angle..
how to find the perimeter of a right angled triangle using the area
It is the longest side of a right angle triangle.
If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.
The 90 degree angle in a right angle triangle is opposite its hypotenuse.
By using Pythagoras' theorem for a right angle triangle.
it must be a right triangle.
Only a right triangle has a hypotenuse. An isosceles triangle can be a right triangle but it doesn't have to be. If it's not, then it doesn't have a hypotenuse.