Right triangles have some important features that you need to know, especially when learning about the Pythagorean theorem. Here are the key points:

1. Right Angle: A right triangle has one angle that is exactly 90 degrees. This is what makes it a "right" triangle!

2. The Pythagorean Theorem: This is a key rule for right triangles. It says that in a right triangle, if you take the length of the hypotenuse (the side across from the right angle) and square it, you will get the same result as when you add the squares of the other two sides. In simple math terms, it's written as: $a^2 + b^2 = c^2$ Here, $c$ is the hypotenuse, and $a$ and $b$ are the other two sides.

3. Relationships Between Sides and Angles: The lengths of the sides help us find the sine, cosine, and tangent functions. For example, the sine of an angle compares the length of the side opposite that angle to the hypotenuse.

4. Special Right Triangles: There are some special types of right triangles, like the 45-45-90 triangle and the 30-60-90 triangle. Each of these has specific ratios for their side lengths.

Knowing these features really helps when solving problems and using them in everyday situations!