1. The problem asks: What is a 90 degree triangle and can you show it in a drawing? 2. A 90 degree triangle, also called a right triangle, is a triangle that has one angle exactly equal to 90 degrees. 3. The key property of a right triangle is that one angle is a right angle, which means it forms a perfect L shape. 4. The side opposite the right angle is called the hypotenuse, and it is the longest side. 5. The other two sides are called the legs. 6. The Pythagorean theorem applies to right triangles: $$a^2 + b^2 = c^2$$ where $a$ and $b$ are the legs and $c$ is the hypotenuse. 7. Here is a simple drawing of a right triangle with a 90 degree angle at vertex C: - Side $AC$ and $BC$ meet at a right angle. - Side $AB$ is the hypotenuse. This visually shows the 90 degree angle and the triangle shape.