Final answer:
The next step in writing the formula for the area of triangle XYZ is to define z (the hypotenuse) as z = √h² + y² using the Pythagorean theorem.
Step-by-step explanation:
The student is working on a formula for the area of a right triangle using the lengths of the sides and angles. Considering that the triangle XYZ is a right triangle with angle Z being the right angle, side YZ as height (h), and side XZ as base (y), the next step would be to employ the Pythagorean theorem, which relates the legs of a right triangle with the hypotenuse. The formula for the area can be expressed as 1/2 × base × height, and using the Pythagorean theorem, the relationship is c = √(a² + b²) for a right triangle with legs a and b and hypotenuse c. Since h is the height and y is the base, the next step for the student should be to define z (the hypotenuse) as z = √h² + y². This allows the student to express the area of the triangle in terms of h and y.