1. **Stating the problem:** We need to understand what right and left triangles are, explain their properties, and provide a drawing. 2. **Definition of a right triangle:** A right triangle is a triangle that has one angle exactly equal to $90^\circ$ (a right angle). This angle is called the right angle. 3. **Right triangle properties:** - The side opposite the right angle is the longest side, called the hypotenuse. - The other two sides are called legs. 4. **Left triangle explanation:** The term "left triangle" is not a standard geometric term. However, sometimes people refer to a right triangle oriented so that the right angle is on the left side as a "left triangle." It is simply a right triangle rotated or flipped. 5. **Summary:** Both "right triangle" and "left triangle" refer to right triangles; the difference is only in orientation. 6. **Drawing:** Below is a right triangle with the right angle on the left side, illustrating the "left triangle" orientation. 7. **Diagram labels:** The right angle is marked, and the hypotenuse and legs are shown. Final answer: A right triangle has one $90^\circ$ angle. A "left triangle" is just a right triangle oriented with the right angle on the left side.